Made of high quality carbon steel, anti-rust, anti-corrosion, increased surface hardness, sturdiness and durability, as well as long service life.^ 1/4 inch hex handle design, suitable for most power tools. The knife tip has an angle of 90 in order to achieve a sharp and precise counterbore.^ The five-blade design enables free chip flow and fast, rattling, free cutting. Perfect Helper Center Punch, marks the workpiece with a dimple to prevent screws and drills from wandering.^ Very suitable for wood openings, rubbing, chamfering, screw heads, etc. Suitable for chamfering wood, plywood, aluminum, fiberboard, chipboard, plastic, PVC sheets and other soft materials.^ The package contains: 6 drill bits size: 6mm, 1/4mm, 8mm, 9mm, 12mm, 16mm, 5mm inch), 19mm (3/4 inch).