Western Gear SpeedFlex Press Knobs. Roller Adjusting Knobs off a SpeedFlex Press. They are the Larger of the Knobs for the Press, I have Smaller ones for sale in another listing. Chrome Plated metal knobs. Measure 4.250″ across the face, the collar is 1.375″ and the mounting hole is. 500 drilled for a. 125 Pin and come with a Set Screw. Knobs weigh in around 1lb. Black Paint on the front of these is flaking off but can easily be repainted. These mount on a. Press Tag not included, shown only for press information.