Features 1、Clamp Collar: Can firmly fix parts to shaft, the secure clamping will do no damage. Also, the fixing mechanisms for parts and shafts are completely independent of each other. 2、Safe Working: You can easily tighten the clamp bolts the the high speed shaft, and there is no need to worry about the distortion of the through hole spacing required for mounting the parts. 3、Smart Design: The 1/4in D shaped centre hold together with 4pcs through hole enables easy installation to parts with threaded holes, which is very convenient and quick to finish. 4、Wide Utility: Able to clamp on hard to get places, you can secure shaft collar to the gear, sprocket, pulley or wheel first and then fasten the assembly to the shaft during assembly. 5、Good Material: Forged with high quality aluminium alloy material, has high hardness, very durable with wearing as well as long term use. Specification Item Type: Clamp Collar Material: Aluminium Alloy Centre Hole Shape: D Shape Centre Hole Diameter: 1/4in Thread: M4 Purpose: Fix the part to the shaft by clamping. Package List 1 x Clamp Collar