7PCS Woodworking Square Hole Drill Bit Set Square Mortise Drill Square Eye Drill Square Hole Opener 1.Wood Drill Bits are designed for drilling softwoods, hardwoods, plastics, particle boards and more. All bits are made of high quality, high carbon steel with a 46-48, hardness rating to ensure long life and precision drilling. 2.Each drill bit is polished to improve sliding and reduce friction when drilling. Both the drill and plastic bits are helical with centering tips. 3.This multifunctional tool is suitable for drilling holes in wood of different densities and hardnesses. Thanks to the different drill sizes, you can choose the right diameter for drilling different sized holes. 4.Polished, high speed steel - an indispensable tool for all woodworkers. Comes in a handy drill box. Color: silver Material: high carbon steel Size: as shown Packing: 7PCS square hole drills