Features 1、Made of high quality aluminum alloy, these clamping collars have high hardness, wear resistance and durability. 2、The parts are fixed by clamping, which will not cause any damage to the fixed parts and will not deform the pitch of the threaded holes. 3、Increase the clamping force and pressing area, provide greater supporting force to resist heavy radial load, and the clamping length is long, up to 20mm. 4、The weight and volume are balanced, which can effectively avoid the centrifugal force and vibration caused by the unbalanced weight and volume of the parts. 5、Can produce a balanced and firm clamping force, and can ensure that the components fixed on the shaft will not move or loosen. Specification Item Type: Clamping Collars Material: Aluminum Alloy Model: 331000160008, 331000160012 Center Hole Size: Approx. 8mm / 0.3in (Round Hole), Approx. 12mm / 0.5in (Round Hole) Thread: M4 Use: Connect the Shaft and Column by Clamping Without Causing Any Damage to the Fixed Parts Package List 5 x Clamping Collars