Detailed Product Description 5C ColletsMaterial 65MnHardnessclamping part HRC5560,elastic part HRC4045 This unit is applicable to all sorts of milling machines,which spindle taper hole is R8,such as X6325,X5325 etc TypeClamping rangeWt(kg)mminRound1281/321-1/80.24Square3191/83/4Hex3221/87/8