Feature: 1. Scope of Application: Suitable for drilling holes on stainless steel iron copper aluminum wood acrylic sheet etc. 2. Applicable to ordinary drill electric drill. 3. The drill bit is made of high-quality high-speed steel high sharpness and wear resistance 4. High drilling efficiency can be used in industrial and household. 5. Cutting edges are ground and processed to ensure fast drilling. Specification: Item Type: Drill Bits Material: High Speed Steel Quantity: 10pcs / box Optional Diameter: 4.0mm 4.2mm 4.5mm 4.0mm 10PCS per box / full grinding 4341 (1 box total) 4.2mm 10PCS per box / full grinding 4341 (1 box total) 4.5mm 10PCS per box / full grinding 4341 (1 box total) Scope of Application: For drilling (Suitable for stainless steel iron copper aluminum wood acrylic sheet etc.) Applicable Equipment: Ordinary drill electric drill. Package List: 1 Box of Drill Bits