Thumb screw knob for M4 socket head cap screw - octagon knob, 4 sizes 20/25/30/36 mm, no supports

Eight flats. Twelve would have been invisible - the faces would sit less than one percent below the circle. Eight sit at 92.4 percent, and that you can see and feel. Takes the head of an ISO 4762 (DIN 912) socket head cap screw M4 from the back. A hex boss in the pocket floor engages the screw's socket, so the knob turns the screw instead of slipping round it. The shank points out of the back, the front stays closed. M4 holds carriage plates, camera mounts and small jigs. ## Sizes in the downlo…

♥ 0