Feature:1. This hole opener uses a triangular foot handle, which is more stable during use, and will not slide or deviate.2. After heat treatment, the cutting head becomes sharper, more durable and sturdy, and longer lasting.3. You can tighten the fixing screws with a wrench to make the drill more stable and safer during work.4. The hole diameter is 18mm, total length is 50mm, working depth is 30mm, and drill shank diameter is 10mm.5. Wide range of applications, can be used to open holes in tiles, wood, glass, wall, etc., with a complete shape of the opening.Specification:Item Type: Hole OpenerMaterial: Alloy SteelHole Size: Approx. 18mm / 0.71inTotal Length: Approx. 50mm / 1.97inWorking Depth: Approx. 30mm / 1.18inDrill Shank Diameter: Approx. 10mm / 0.39in Package List:3 xHole Openers