Brand: SureMotion Item: Drive coupling hub Material: Aluminum alloy Requires: DC-JS40 series spiders Outside Diameter: 39.8mm Bore Diameter: 16mm Attachment Style: Clamp Overall Length: 64.8mm Coupling Type: Jaw type Maximum Angular Misalignment: 1.2 degrees Coupling Size: 40 Maximum RPM: 11200 Maximum Parallel Misalignment: 0.2mm SureMotion drive coupling hub, jaw type, aluminum alloy, clamp, size 40, 16mm bore. Requires DC-JS40 series spiders.