The star head is made of high quality plastic, which has good toughness and impact resistance and is . The is made of carbon steel, which is -, high in hardness, rust-proof and . Large plastic knurled handle, comfortable grip, full thread -in design, easy to install, disassemble and adjust. These thumbscrews are widely used in mechanical equipment, electronic equipment, communication equipment, hardware, furniture decoration and other related industries., Manufacturer: Littimoon