UNIVERSAL 1/4″-20 x 1 Threaded Knurled Thumb Nuts, Black Plastic Knobs O2 Tank Screws Thread diameter: 1/4″; Thread Length: 1″; Star knob diameter: 25mm/0.98″; Star knob overall thickness: 11mm/0.43″ Star shaped knob thread is made of carbon steel, which is wear-resistant, rust resistant, and corrosion-resistant Knob is made of plastic, with a smooth and crack free surface, lightweight and durable Star shaped clamping knob provides good tightening control to screw effectively and safely without scratching hands 10 pieces/pack, threaded knurled thumbscrews Never lose screws again with: #72-0245
