ITEM NAME:1Pcs C20 Er16 32L 8Mm Spindle Motor Clamp Rod + 1Pcs Er16-1/8(3.175)Mm Coll O5Q7 1Pcs C20 Er16 32L 8Mm Spindle Motor Clamp Rod + 1Pcs Er16-1/8(3.175)Mm Coll O5Q7.ER16 Collets: ER16-1/8(3.175)mm. 1 ER16-8MM spindle motor clamp. 1 ER16-1/8 spindle collet. Shaft hole : 8mm (-0.02mm) when installing need heating expansion. Type : Motor shaft clamping tool rod. Body length : 32mm,contain the nut length is 40mm.