High speed steel drill set is multifunction and practical for home decoration and industrial use. The drills can be used for drilling or expanding wood, stainless steel, mold steel, steel board and different kinds of metal material. Perfect accessories for electric drill! Features: 6 pieces/ set: 4-12mm/ 4-20mm/ 4-32mm step drill, 3mm/ 6mm/ 8mm saw drill. Plastic bag package or plastic storage box package for option. High speed steel material, high strength and durability. Ti plating surface reduces the probability of drill and material bonding. This drill set can meet various needs, and is mainly used for wood, stainless steel, mold steel, steel sheet and different kinds of metal material. Perfect accessories, the drill bits can be compatible with electric hand drill and lithium battery powered electric drill. Multifunction and practical tool for woodworking, decor, DIY, industry, etc. Compact and lightweight, easy to carry. Note: Size and color may be slightly different because of manual measurement and different light conditions. Thank you for understanding. Specifications: Package: Plastic Bag/ Plastic Box (Optional) Material: High Speed Steel Surface Treatment: Ti Plating Step Drill: 4-12mm/ 4-20mm/ 4-32mm Saw Drill: 3mm/ 6mm/ 8mm Package Size: 12 * 10 * 3cm / 4.72 * 3.94 * 1.18in (Plastic Bag); 17 * 11.6 * 3.3cm / 6.69 * 4.57 * 1.30in (Plastic Box) Package Weight: 270g / 9.52oz (Plastic Bag); 400g / 14.11oz (Plastic Box) Package List: 3 * Step Drill 3 * Saw Drill