1PCS D30L40 SB Rigid Clamp Coupling Bore 5/6/6/8/9/9/10/11/12/12/14/15/16mm Aluminium Drive Shaft CNC Jaw Shaft Motor Coupler Descriptions: Type: SB Rigid Clamp Coupling D (Outside diameter): 30mm L (Inside Length): 40mm d1: 5mm/6mm/6/8mm/9mm/10mm/11mm d2: 5mm/8mm/9/10mm/11mm/12mm/12/14mm/15mm/16mm Material: Aluminum alloy Package list: 1 laptop computer D30L40 SB Rigid Clamp Coupling