Check the listing for details. Thumb screw M4x20mm Wing nut computer PC Camera electronics Hand grip Bolt Saw. Condition: New, Made in China. Listed at 3.69 USD. Check out my other items! Be sure to add me to your favourites list! Plastic Thumbscrew Knob Male M4 x 20mm thread length Thumbscrew Knobs An ideal alternative to an ordinary nut or bolt, suitable where a small, discreet product is required or where space is confined. Low profile knurled thumbscrew knob suitable where fine adjustment is required. Thread length 22 5.9 7.1 12.4 M4 20 Any Questions please ask Material: Duroplast Standard Colour: Black Finish: Gloss Thread Material: Zinc plated steel Suitable Applications: Office furniture Medical aids and equipment Industrial machinery Aerospace equipment Construction equipment Marine furniture Agricultural machinery Electronics enclosures Point of Sale Printing equipment Packaging and processing equipment Lighting equipment Audi.