【Fits For】: RC Upgrades Part for 1/10 GRANITE 4WD V3 MEGA 550（ARA4202V3)， 1/10 GRANITE 4X2 BOOST MEGA 550（ARA4102V4），1/10 GRANITE 4X4 MEGA 550（ARA4202XV3）， 1/10 SENTON 4WD V3 MEGA 550（ARA4203V3）1/10 SENTON 4X4 MEGA 550 （ARA4203XV3） 1/10 SENTON 4X2 BOOST MEGA 550（ARA4103V4）1/10 VORTEKS 4X2 BOOST MEGA 550（ARA4105V4） 1/8 TYPHON 4WD V3 MEGA 550（ARA4206V3）Replaces ARA311111 【High precision】:The gear set is with precision manufactured gear teeth for smooth, consistent performance,they works with low noise. 【Long-lasting Performance】:We provide 3 different teeth3.175mm pinion gear(21T/23T/25T) to make you more choice in gear ration. 【Easy to Install】:Easy to install, all metal internal gears for high strength. Made of heavy duty hardened steel, long time life span. Easy to install and remove 【Special note】:In the position of various screw holes, screw glue is applied, so that the screws are not easily separated from the upgrade accessories. hopsupRC Metal Spur Gear Slipper Clutch 87T with 3.175mm(21T/23T/25T) Pinions Gear Set Upgrades Part for 1/10 Senton 4X4 550,Granite 4X4 550,VORTEKS MEGA 550,1/8 Typhon 4X4 550,Navy Blue