Main Features【6 Size Combo Set】6 most commonly used sizes to meet all your needs. This drill bit set fits most electric drill rods on the market today and come with a portable plastic bag for easy storage and organization.【M35 High Speed Cobalt Steel】Industry grade 6542 high speed steel drill bits parts set, tougher than 4241 HSS used in other similar drill bit set. These drill bits also contain 5% cobalt for increased wear resistance and durability.【Fully Grounded Process & 135 Degree Split Point】The fully ground spiral flute design quickly reduces friction and heat for faster and cooler drilling performance. The 135 degree split point with a straight shank prevents walking and makes drilling precise and faster. No middle blow is needed.【Multiple Application】Suitable for cutting hard metal, such as stainless steel, steel and cast iron, as well as wood, aluminum alloy and other softer metals, including tile, concrete, tile, brick, wood, plastic, glass, masonry and more.【Working Efficiently】The product has sharp edges and high drilling efficiency. The center of the product has sharp series, and with its help, the drill bit can continue drilling horizontally after drilling. Application scenarios Suitable for towing, cutting wood, soft metal, aluminum plate, iron, etc. SpecificationMaterialsHigh Speed SteelPackage Contents3-8mm Titanium Coated Hss Drill Bit Set3mm×14mm×15mm×16mm×16.5mm×18mm×1Product SizeNoteWhen drilling hard materials (glass, ceramic tile, marble, or granite), lubricate with water. Etc. Due to manual measurement, please allow slight deviation in measurement. Due to different display and lighting effects, the actual color of the item may be slightly different from the color displayed on the pictures.