Compatible with Traxxas Slash 4x4 4WD/2WD/VXL /Rustler 2WD/4x4/ Rally/Stampede 4x4 VXL /Traxxas 1/10 Summit/Trxxas 1/10 E-REVO/T-Maxx/Jato/Rustler 4X4 VXL/Summit/T-Maxx. 54T main gear comes with 15T/17T/19T motor pinions and 3.175mm coupler.Three pinions is 5mm, Using the coupler can convert Three pinion apertures to 3.175mm.So these RC Gear Set work on motors with 5mm or 3.175mm shaft diameter, such as 3660 3670 3674 4274 4268 550 540 3650 etc series motors. 54T main gear replace 3956 0.8 metric pitch; compatible with 32-pitch; pinion inner hole diameter: 5.0mm/0.196 inch; main motor gear dia.: 45mm/1.77 inch Durable: the RC Pinion Made of heavy duty hardened steel; The Coupler Sleeve Adapter made of Quality Alloy. Material: Metal colour: As shown Package Contents: 1 x 54T Gear 1 x 15T Pinion 1 x 17T Pinion 1 x 19T Pinion 6 x Set Screws 3 x Coupler 2 x Screw Wrench Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.