The ramp spring is made of heavy duty steel, exterior semi-gloss coated with black powder. Size: 11 coils, 2" long ears, 1"+ I.D. coil length 5" , spring length 10". Easy to install, remove the hinge, then reassemble the new hauler ramps spring. Replacment ramp door spring, ideal replacement for 173067 springs. Timely replace the trailer ramp torsion springs, help to lift heavy trailer ramps. Medium Duty Ramp Door Spring for Replacement Toy Hauler < br > < br > Feature:< br > < br > 11 Turn Spring< br > < br > Wire Diameter: 3/8" (0.375)< br > < br > Barrel Diameter: 1 inch< br > < br > Coil Length: 5 inch< br > < br > Spring Length Overall: 10 inch< br > < br > Heavy duty steel< br > < br > Semi-gloss, black powder coated< br >