Brand new Type : Motor shaft clamping tool rod Model : C16-ER11-5mm Nut : ER11A type (the Hexagonal nut largest outer diameter is 19mm) Body length : 34mm,contain the nut length is 40mm Shaft hole : 5mm (-0.02mm) when installing need heating expansion Packing content : 1 x C16-ER11-35L 5mm motor shaft clamping tool rod