Specification Brand : BQLZR BulletPoint1 : The Coupler is zero backlash,and Designed to help compensate for misaligned parallels and Replacement for AXIAL. BulletPoint2 : High quality aluminum coupler is widely used to connect servo motor, stepper motor, encoder, screw driving, machine platform, etc. BulletPoint3 : The Coupler is zero backlash,and Designed to help compensate for misaligned parallels and Replacement for AXIAL. BulletPoint4 : Shaft: 5mm x 8mm/0.2 x 0.31" BulletPoint5 : Size: 19 x 25mm/0.75 x 0.98"(Dia x L) Color : Silvery ExteriorFinish : Silver ExternallyAssignedProductIdentifier1 : 704256168377 ExternallyAssignedProductIdentifier2 : 0704256168377 FinishType : Aluminium ItemName : BQLZR 5x8mm D19L25 Flexible Shaft Coupling CNC Stepper Coupler Pack of 2 ItemPackageDimensions_Height : 7.11 centimeters ItemPackageDimensions_Length : 1.27 centimeters ItemPackageDimensions_Width : 7.11 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : spider-couplings Manufacturer : BQLZR Material : Aluminum MaximumAngularMisalignment : 1 degrees MaximumRotationalSpeed : 5000 rpm MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType : Aluminum ModelNumber : BQLZRN08920 NumberOfItems : 1 PartNumber : BQLZRN08920 ProductDescription : Note: The color of the item may vary slightly due to photography and your own computer Feature: High quality aluminum coupler is widely used to connect servo motor, stepper motor, encoder, screw driving, machine platform, etc. The Coupler is zero backlash,and Designed to help compensate for misaligned parallels and Replacement for AXIAL. Specification: Material: Aluminium Alloy Color:Silvery Shaft: 5mm x 8mm/0.2 x 0.31" Length: 25mm Diameter: 19mm Size: 19 x 25mm/0.75 x 0.98"(Dia x L) Weight: 30g