Specification Brand : MEIHAOCNC BulletPoint1 : Material: Aluminum alloy, polyurethane. Type: Plum shaped BulletPoint2 : The shaft couplers are mainly used for CNC machines,servo motors, spindle, step motor etc BulletPoint3 : Flexibility of coupling shaft removes stress between the motor and driving components BulletPoint4 : Super torque can absorb vibration, appropriate a large torque transmission. BulletPoint5 : High hardness,Durable,and excellent response,not easy to loosen ItemDisplayWeight : 0.06 kilograms ItemName : CNC Motor Coupler Outer Diameter D30 Length L40 Inner Hole 6mm-16mm Flexible Coupling Connector for Ball Screw Lead Screw MEIHAOCNC (6.35 X 10) ItemTypeKeyword : beam-couplings Manufacturer : MEIHAOCNC ModelNumber : XBD30L40 NumberOfItems : 1 PartNumber : XB3040-6.35 X 10 ProductDescription : Origin : China Material : Aluminium Model Number : XB D30L40 Standard or Nonstandard : Standard Structure : Jaw / Spider Flexible or Rigid : Flexible max torque : 14.8Nm Rated torque : 7.4Nm max speed : 12000RPM keyway: 5mm