Brand: SureMotion Item: Drive coupling hub Material: Aluminum alloy Requires: DC-DDS25 torque disc Outside Diameter: 25.4mm Bore Diameter: 3/8in Attachment Style: Clamp Overall Length: 32.5mm Coupling Type: Oldham Rated Torque: 4 N-m Maximum Angular Misalignment: 3.0 degrees Coupling Size: 25 Maximum RPM: 3000 Maximum Parallel Misalignment: 0.41mm SureMotion drive coupling hub, Oldham, aluminum alloy, clamp, size 25, 3/8in bore. Requires DC-DDS25 torque disc.