1. The screw is made of high-grade carbon steel with a surface hardness of 500-550HRC and strong toughness. It is suitable for screwing woodworkers after drilling holes. It is sturdy and durable. The surface is galvanized, antirust and corrosion resistant. 2. The screw head is sharp, easy to drill into the wood and plastic 3. Can play hardwood Colour: Silver Material: metal Size: 50mm Package Contents: 100 x Pocket Hole Screws Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.