Instruction: ˇ´Use for T-REX 600/600 Nitro.Specification: ˇ´Main shaft x 2(Φ10x201x29.3mm) ˇ´Lock collar x 1(Φ10xΦ16x6mm) ˇ´M4 set screw x 2(M4x4mm) ˇ´Socket collar screw x 2(M3x22mm) ˇ´M3 nut x 2