With this metal bottle opener insert kits, you can apply various material to DIY unique bottle openers as you like, such as wood, metal, plastic, resin and so on. Sturdy Material: Our bottle opener insert is made of metal with rustproof coating, sturdy and durable, which will not deform easily even after long time using. How to Use: First , you need to make a bottle opener mold with the material you like. Than, you can fix the bottle opener insert with the provided screws. One bottle opener insert matching 2 screws. Colour:silver Material:Metal Size:Diameter: about 4cm Package Contents: 50 x Wrenches 100 x Screws 2 x Screwdrivers Only the above package content, other products are not included. Note: Light reflection 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.