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 : 0.03 kilograms ItemName : Motor Coupler XB25-30 Outer Diameter D25 Length L30 Inner Hole 4-12mm Flexible Coupling Connector for Ball Screw Lead Screw MEIHAOCNC (6.35 x 7) ItemTypeKeyword : beam-couplings Manufacturer : MEIHAOCNC ModelNumber : XBD25L30 NumberOfItems : 1 PartNumber : XBD25L30-6.35 x 7 ProductDescription : Origin : China Material : Aluminium Model Number : XB D25L30 Standard or Nonstandard : Standard Certification : CE Structure : Jaw / Spider Flexible or Rigid : Flexible max torque : 10Nm Rated torque : 5Nm max speed : 17000RPM inner hole : 4-12mm