CAT CT660 Day Cab Tractor With XL 120 Low-Profile HDG Trailer 1:50 scale Diecast Masters Diecast Model This CAT CT660 Day Cab Tractor (With XL 120 Low-Profile HDG Trailer) diecast model is yellow & features working wheels, steering & opening bonnet with engine. It is made by Diecast Masters & is 1:50 scale (approx. 53cm / 20.9in long).