Item Type: Shaft Clamping Hub Product Material: Aluminum Product Model: 3309-0016-0006 Thread: M4 Center Hole: Approx. 6mm or 0.2in Length: Approx. 14mm or 0.6in Hex Drive: Approx. 3mm or 0.1in Size: Approx. 6mm or 0.2in 16mm or 0.6in 32mm or 1.3in 0.7mm or 0.03in 14mm or 0.55in 8mm or 0.31in 1mm or 0.04in 1The hub of choice for high speed applications without worrying about shaft damage or loss of fixing screws. 2The clamping mechanisms used to fix the hub to the shaft are completely isolated from each other. 3The double clamping bolts can be tightened to clamp it on the shaft without deforming the hole required to install the component to the hub. 4The hub can be fixed to gears, sprockets, pulleys or wheels, because the clamping mechanism can work no matter what the hub is connected to. 5Small size, easy to carry and store, convenient to use and with good performance.1 x Shaft Clamping Hub