CAT D8T Track-type Tractor with 8U Blade 1:50 scale Diecast Masters Diecast Model This CAT D8T Track-type Tractor with 8U Blade diecast model is yellow & features working ripper, tracks, blade. It is made by Diecast Masters & is 1:50 scale (approx. 16cm / 6.3in long).