DescriptionMaterial:Steel.Version:Sleeve blue electro zinc-plated. Spring pins black oxidised.Note:The tapped hole in both ends of the spring pin allow various inserts to be attached e.g. prisms, thrust pins, self-aligning pads, knobs, grips etc.Assembly:LOCTITE threadlocker K0655.243.... is recommended for gluing the threaded sleeve in position.Special features: