Accessories:3mm Steel Hex Shim-2pcsM4x2.5x11 Screw Shaft-2pcs4x2.5 Silicone O-Ring-2pcs3x3 Screw Shaft-2pcsManual number:6828X+6850X+6854X Product major function & usage:Assist the front gearbox to turn the wheelsMajor advantages of upgrading to this...
