Okw top knob marking elements pinarrow 16mm bluegreengrey okw a 11 05 007 this okw a 11 05 007 top knob pin marking element grey 16mm is a simple push on marker that fits snugly into the top knob making the lateral screw fixing invisible while also excluding the contact with live parts it is also possible to make a subsequent replacement of the marker okw a 11 05 007 marking element arrow for top knob mineral