Feature: 1. The parts are fixed by clamping. The advantage of this fixing method is that it does not cause any damage to the fixed parts. 2. Fixing and clamping are completely independent, the diameter of the outer contour is 32mm, which can be installed in places where the clamp cannot be installed. 3. Clamp is made of high‑quality aluminum, which has high hardness, wear resistance and durability. 4. There are 4 through holes, the through holes allow you to fix the high‑speed shaft clamp to the parts with threaded holes. 5. Installation is simple, the high‑speed shaft clamp is installed in any position, and the shaft clamping mechanism can work. Specification: Item Type: Hex Clamping Hub Material: Aluminum Alloy Model: 3311-0016-4008 Center Hole Size: Approx. 5mm / 0.2in (Hexagonal Hole) Thread: M4 Purpose: For Fixing the Part to the Shaft or Shaft by Clamping. Package List: 2 x Hex Clamping Hub Note: It is necessary to match the appropriate design size before installation and use.