Various knobs for cylinder head screws with M3/M4/M6 or M8 thread. For explanation, I have designed two different versions. The standard version has a hexagon socket integrated in the knob. The screw is inserted or glued onto this, whereby the thread length of the screw remains the same. The "thread" - version is for high stress when turning with a very large torque. For this purpose, the screw is screwed into the knob and glued in place. This shortens the screw by approx. 5 mm, but the connection is extremely strong and resilient.