Usage Tips:With this metal bottle opener insert kits, you can apply various material to DIY unique bottle openers you like, such 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:silverMaterial:MetalSize:Diameter: about 4cmPackage Contents:100 x Wrenches200 x Screws4 x ScrewdriversOnly 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.