Alloy four-edged crossdrill, sharping and long-lasting, fast drilling, versatile and accurate hole punching. Sharping drilling edges, high toughness, abrasion resistance, high density hardness, and nice adaptability. Widened spiral texture, smooth chip removal, faster chip removal when operating and using. Hexagonal drill shank with high compatibility, suitable for lithium drill, electric drill, table drill and other power tools on the market. Features: Alloy four-edged crossdrill, sharping and long-lasting, fast drilling, versatile and accurate hole punching. Sharping drilling edges, high toughness, abrasion resistance, high density hardness, and nice adaptability. Widened edges, smooth chip removal, faster chip removal when operating and using, and reduced damping feeling of the drill. Hexagonal drill shank with high compatibility, suitable for lithium drill, electric hand drill, screwdriver and other power tools on the market, ready to install and use, easy to operate. The drill bit is suitable for a variety of materials, such as hardwood, cork, plastic, whetstone, etc. Multiple uses, for avoiding damaging or burning the drill bit, when drilling on tile, glass tile, marble, glass and other materials, it needs to be operated with water all the time. Specifications: Name: Drill Bit Set Material: alloy Type: 10pcs 4mm bits, 10pcs 6mm bits (optional) Shank diameter: 6.3mm Package size: 100 * 50 * 30mm / 3.94 * 1.97 * 1.18in Package weight: 150g / 5.29ounce Packing List: 10 * Drill Bits