The SK X 1/2 is a qd (quick disconnect) bushing for use with QD, TL or taper-lock sheaves, sprockets and pulleys. Provides a positive grip on the shaft with quick installation and removal for OEM and MRO maintenance. Specifications: - Manufacturer Part Number: SK X 1/2 - Product Type: QD (Quick Disconnect) Bushing - Material: Ductile Iron - Bore Diameter: 0.5 in - Bore Type: Finished Bore with Keyway and 1 Set Screw - Outer Diameter: 3.875 in - Set Screw Size: 5/16/2018 - Finish/Coating: Black Oxide - Part Weight: 4 lb Stocked and shipped fast from offroadbelts.com. Industrial-grade replacement part for OEM, MRO and maintenance buyers — order with confidence.