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