CAT Caterpillar 621K Tractor Scraper and CAT Caterpillar D7 Track-Type Tractor with No. 70 Scraper Set "Evolution Series" 1/50 Diecast Models by Diecast Masters

A model kit comes unassembled on plastic sprues (the frames that hold the parts). You cut, glue, and paint the pieces yourself, it's a hands-on building experience that can take anywhere from a few hours to several evenings. A diecast car is a pre-built, pre-painted metal collectible ready for display straight out of the box. Both are scaled replicas, but kits are for builders who enjoy the process, and diecast is for collectors who want a finished showpiece.

Scale is the size ratio compared to the real vehicle:

1:12 — About 14". Museum-level detail, large display piece.

1:18 — About 10". Most popular collector scale. Often features opening doors, hood, and trunk.

1:24 / 1:25 — About 7". Most popular kit-building scale. Great balance of detail and size.

1:32 / 1:43 — About 4–5". Compact, ideal for larger collections.

1:64 — Hot Wheels size. Perfect for collecting by the dozens.

1:87 — Smallest. Typically used with model train layouts.

Choose based on your display space, detail preference, and whether you're building a collection or a single showcase piece.

Start with a snap-together kit, no glue or paint required. Revell and AMT both make great beginner kits in 1:25 scale, rated skill level 1 or 2. Pick a car you love, that motivation makes the build more enjoyable. Once you're comfortable, move to a cement-assembly kit with basic paint. We carry beginner kits starting under $20. Check our Beginner's Guide for step-by-step recommendations including your first tools, paints, and techniques.

It depends on the kit and your preference:

• Acrylic (water-based) — Beginner-friendly, easy cleanup, low odor. Tamiya and Vallejo are popular choices.
• Enamel — Smoother finish, longer drying time, requires mineral spirits. Testors is the classic choice for Revell kits.
• Lacquer — Dries fastest, hardest finish, requires good ventilation. Tamiya TS spray cans are lacquer-based.

Important: Don't mix paint types on the same surface without a primer coat between them. Every paint listing on our site clearly shows the type and compatible brands.

Skill levels help you choose the right kit:

Level 1 — Snap-together, no glue or paint needed. Great for kids and absolute beginners.

Level 2 — Simple glue assembly, minimal painting.

Level 3 (Intermediate) — Standard cement assembly with painting. Most kits fall here.

Level 4 & 5 (Advanced) — Complex builds with many parts and detailed painting. For experienced modelers.

We display the skill level on every kit listing, so you can make an informed choice.

Every product we sell is 100% authentic. We source directly from authorized distributors and carry genuine products from over 60 brands including Tamiya, Revell, AMT, AUTOart, Maisto, Bburago, Hot Wheels, Greenlight, and many more. No counterfeits, no gray-market imports, no relabeled products.

All orders ship within 1 business day. If a product shows "In Stock" on our site, it's ready to go, no backorder surprises, no ghost inventory. Delivery typically takes 3–7 business days within the US. You'll receive a tracking number via email as soon as your order leaves our facility.

Orders over $99 ship free within the United States. For orders under $99, shipping is calculated at checkout based on package weight and your location. We also ship to Canada, though international rates vary. A progress bar in your cart shows how close you are to the free shipping threshold.

Yes, we ship to Canada. Rates are calculated at checkout. International orders may be subject to customs duties and import taxes (buyer's responsibility). Delivery to Canada typically takes 7–14 business days. For other destinations, contact us to discuss options.

Every order is double-boxed with bubble wrap, the product box is wrapped and cushioned inside a larger shipping box. For fragile or high-value diecast models, we add extra padding. Our customers consistently mention our packaging quality as a reason they come back.

Yes. If a product shows "In Stock," it is in our warehouse and ready to ship. We do not list items as available if they're on backorder or in transit from a supplier. We know how frustrating it is to order something marked "in stock" only to get a backorder notice days later, that doesn't happen here.

Yes. Once your order ships, you'll receive an email with a tracking number and link to follow your package in real time. You can also log into your account to view order status at any time.

We offer a 30-day return window from the date of delivery. Items must be in original, unopened condition. For opened kits or diecast with damaged packaging, contact us, we handle these case-by-case and always try to find a fair solution.

If your item arrives damaged, contact us right away with photos of the damage (both product and shipping box). We'll send a replacement or issue a full refund, no runaround, no fighting. If we shipped it, we take responsibility for it arriving safely.

Email us at customerservice@modelcars.com. We're real people, not bots, not an outsourced call center. You'll get a personal response, typically within 24 hours. We pride ourselves on making things right when issues come up.

Contact us immediately and we'll ship the correct item right away, at no cost to you. We'll also provide a prepaid return label for the incorrect item. You won't pay a cent to fix our mistake.

We strive to offer competitive pricing across our 25,000+ products. While we don't have a formal price-match guarantee, reach out to us if you find a lower price on an identical in-stock item at another authorized retailer. We'd rather earn your business than lose it over a few dollars.

We're actively exploring ways to reward repeat customers. Right now, the best way to save is through our free shipping over $99 threshold and our sale and clearance section. Sign up for our email list to be the first to know about exclusive deals and any future loyalty program.