1、Shaft holder has been designed to reduce weight to reduce unnecessary rotating mass and is lightweight. 2、Weight and volume are balanced. In high‑speed applications, it can effectively avoid the centrifugal force and vibration caused by the unbalanced mass and volume. 3、There are 6 M4 threaded holes with a pitch of 8mm in the 16mm grid, and the threaded holes provide great installation flexibility. 4、Made of high‑quality aluminum alloy, light weight, good strength, good corrosion resistance, and durable. 5、Wide range of applications, can be used in intelligent robots, engineering and medical equipment, etc. Item Type: Flange Coupling Material: Aluminum Alloy Model Size: Model Aperture Size 3308-0016-0004 4mm 3308-0016-0005 5mm 3308-0016-0006 6mm 2 x Flange Coupling