Cut steel, stainless steel, copper, brass, aluminum, fiberglass, bakelite and other laminates in seconds.It is very suitable for installing locks, knobs in doors and cabinets or drilling larger diameter holes through desks, etc.note:1. The cutting material must be fixed, not moving, and 90 degrees at right angles to the opening2. When you first start drilling, you should slowly contact the material to be drilled, and not hit the workpiece. At the same time, it is suitable for low drilling numbers (the larger the hole opener, the lower the drilling number)3. Coolant can be added if possible. Please slow down when drilling through. If there is any abnormality, please stop drilling and continue after cleaning.Colour:Silver + BlackMaterial:high speed steelSize:12/14/16/18/20/22/25/28/30/40mmPackage Contents:10 * hole openers10 * wrenchesOnly 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.