Round Thumb Screw Knob:

Plastic Nuts and Bolts.coms' Nylon Press-Loc Knobs are designed to press onto standard steel hex head cap screws, hex nuts, and slotted and unslotted head machine screws. Knobs are easily assembled by pressing the steel nut or screw into the plastic knob.

NOTE: 29RN will fit hex nuts and hex head cap screws. 29RNS will fit slotted and unslotted hex head machine screws.