Item Type: Shaft Clamping Hub_x000D_Material: Aluminum_x000D_Model: 3310-0016-1006_x000D_For REX Axis: Accepts 12mm for REX_x000D_Thread: M4_x000D_Center Hole: D bore diameter approx. 6mm / 0.2in_x000D_Diameter: Approx. 30.6mm / 1.2in_x000D_Size: Approx. 16mm / 0.6in_x000D_14mm / 0.6in_x000D_20mm / 0.8in_x000D_21mm / 0.8in_x000D_22mm / 0.9in_x000D_Depth: Approx. 9mm / 0.4in_x000D_M4 x 0.7mm_x000D_Length: Approx. 12mm / 0.5in_x000D_Hex Drive: Approx. 3mm / 0.1in 1The design is both balanced and durable. Compared with the standard clamping hub, the barrel length of the for Hyper hub is increased 2Provides more surface contact between shaft and hole, thus achieving ultra-tight fixation 3This length not only increases the holding force, but also provides greater support to resist larger radial loads 4The D-bore matches the 6mm D?axis, so can generate positive driving force, and there is basically no chance of slipping 5This shaft clamping hub accepts 12mm for REX axis, easy to use, very convenient1 x Shaft Clamping Hub