1,The HSS drill bits are for cutting through hard metal, like stainless steel, aluminum alloy, and ti alloy 2,Accuracy grinding inclined blade helps make sure fast drilling, impressive cutting power, and excellent chip removal 3,This product can drill through metal easily with help from this high‑speed steel drill bit set. Great for professionals and DIYers alike, the drill bit set comes in handy for a variety of projects, whether at home or on the jobs 4,Each drill bit in the set features high‑speed steel construction with a ti surface coating for high hardness, long‑lasting strength, and best cutting power. 5,Drill through metal easily with help from this high‑speed steel drill bit set. Feature:The HSS drill bits are for cutting through hard metal, like stainless steel, aluminum alloy, and ti alloyAccuracy grinding inclined blade helps make sure fast drilling, impressive cutting power, and excellent chip removalThis product can drill through metal easily with help from this high‑speed steel drill bit set. Great for professionals and DIYers alike, the drill bit set comes in handy for a variety of projects, whether at home or on the jobsEach drill bit in the set features high-speed steel construction with a ti surface coating for high hardness, long-lasting strength, and best cutting power.Drill through metal easily with help from this high-speed steel drill bit set. SpecificationsItem Type: Spiral Drill Ti Coated 99 Pc Piece HSS Drill Bit Set Material:4241 Delivery in time Nice product accuracy Product Description 1 Metal kit packing 2 Industrial standard 3 HSS4241 material 4 For drilling hole Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.