Product Details This Mibro 10 pc. HSS Drill Bit Set can be used to drill in wood, plastic, and softer metals such as aluminum. Ideally suited for most projects around the house. This drill bit set is suitable for use on wood, wood composites, plastics, and repetitive drilling in most metals - not recommended for hard metals such as stainless steel 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4 in. This drill bit set is suitable for use on wood, wood composites, plastics, and softer metals such as aluminum and copper 135 split point tip on all drills 1/8 in. diameter and larger eliminates the need for a center punch and keeps the drill bit from walking 3 flats on drill shank larger than 3/16 in. Ensure that it is held tightly in the drill chuck