DescriptionMaterial:Version:Jaws black oxidised. Screw blue electro zinc-plated.Note:These shaft clamping units are the simple alternative to conventional shaft clamping (slot and grub screw). The units are suitable for various materials (metal, plastic, wood etc). To loosen a jammed clamp simply hit it axially or extract it using a screw in the jaw end or screw head.Special features: