These wing screws are made of 304 stainless steel, which are to rust and . Which can be generally used in home and office appliance, machinery, furniture, etc. HIGH QUALITY -- M5 Butterfly Wing Hand Screws Bolts are made of high quality 304 Stainless Steel. The 304 Stainless Steel material features strength and offers good resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and the excellent of oxidation resistance, which can long time using THREAD -- Our screw thread is very , clean and accurate. And the compact thread is not easy to out of shape and slid in the process of rolling. Our screws bolts accord with standardized metric system WIDE APPLICATION -- M5 Butterfly Wing Hand Screws Bolts Fastener are great for professionals, amateurs, landlords, handymen, repair men, women, woodworking, construction, plumbing, HVAC and so on. They also worked well for 3D printed projects. The kit is perfect to replace broken lost. Use on sheet metal and wood. The Kit is an perfect tool for home and workplace, too. Type: Wing Screw Function: Machinery Industry Fastener Colour: silver Material: 304 stainless steel Package Contents: 5 Screws (M5 x 40mm) NOTE: Products contain small parts, please do not let children play to prevent inadvertent swallowed. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.