This drill bit set is compatible with most current electric drills. The titanium coating increases wear resistance and durability. - Despite its compact size, it offers excellent compatibility and is highly practical. - The drill bits are designed for precise positioning and fast penetration. - Suitable for cutting straight or angled holes in hardwood, softwood, end-grain, cross-grain, and laminate. They offer superior accuracy and longevity compared to copper drill bits; in particular, their toughness is many times greater, resulting in high strength and resistance to breakage during machining. Product Name: Hinge. Material: High-Speed Steel. Product Features: Precise positioning, with wood chips ejected from the top of the drill bit to prevent it from getting stuck. Type: Mandrel. Length: As shown. Model: Metal Cutting Drill. Application: Drilling in metal. The drill sleeve provides better positioning and improved drilling results. Sizes and Quantity: 4-piece set: 5/64", 7/64", 9/64", and 11/64". Color: Silver. Note: Light reflection and different monitors may cause the color of the item in the picture to be slightly different from the actual item. The measurement allowable error is +/- 1-3 cm.