Clamping knob with a through hole for an M4 screw and a pyramid-knurled surface around its entire circumference, offering a firm grip even with damp or oily fingers. The smooth top and domed profile make it comfortable to turn, while the central core accommodates the screw head flush. It is suitable for tool handles, adjustable guides, mounting brackets, mechanical devices and hand tightening where the use of a wrench is to be avoided. Maximum diameter 180 mm