Achieve precise and clean holes with the MYWISH 15-Piece Brad Point Drill Bit Set. Each bit features an 8mm (approx. 20/64 in. or 5/16 in.) diameter with a straight round shank, an overall length of 110mm (approx. 4 in.), and a maximum cutting depth of 80mm (approx. 3.1 in.). Crafted from durable carbon steel, these bits offer high hardness and a long service life, resisting breakage. The brad point tip ensures pinpoint accuracy when starting your holes, preventing wandering, while the widened and deepened chip removal groove efficiently clears debris, boosting your work efficiency. Suitable for bench drills, electric drills, and cordless drills, this MYWISH set excels in various softwoods, hardwoods, plywood, plastic, rubber, and polyurethanes. Not for use on metal, masonry, or glass.