If there are any questions before and after purchase, please welcome to contact us, we will try my best to solve all for you. Slotted Thumb Screws 6 X 1" Thub Screws With Wing Knob - Thubscrews Thub Screw... Thumb Screws For Sale Features: Material: 304 Stainless Steel Butterfly Wing Head Easy to Hand Tighten Note: All items have tolerence, actual product shall prevail. Thread Material – Stainless Steel - anti-rust and anti-corrosion, strong and durable Package Content: 3 x Thumb Screws with Wing Knob Easy to install and remove, can be used repeatedly 3/8-16 Standard Thread Knurled Thumbscrew Grip Knobs Thumb Screw Tee Wing - 3/8 x 1 1/2 Thumb Screws with Wing Knob Screws & Thumbscrews - - Quality Rubber Feet & Bumpers Thub Screws with Wing Knob - 8 x 40 Thub Screw Butterfly Thub... Machined thumb screws are installed in pre-drilled and tapped holes and tightened by hand. They are ideal for electronics and equipment covers