Drill & Screwdriver Bits features: Hss 3 Piece Step Drill Set Spiral Groove Peeling Drill Drill Cone Drill Metal Drill Drill Set Cut Tool Set For Metal Wood Plastic Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. Product description Product feature: 1. No need for pilot drilling 2. Titanium coated to reduce friction and run more smoothly 3.The good bit has a 3-sided tree. 4.Automatically deburr holes as you drill, high speed steel, durable. 5. Widely used for cutting holes in a variety of materials such as steel, wood, thin iron, aluminum alloy, insulation board, PVC film, etc. Specification: Color: golden (shown as the picture) Material: high speed steel Surface: titanium coated Scop: thin iron plate, aluminum, insulation boards, 4mm thick PVC panels in wood. Size: From 4 to 12 mm 9 steps (4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm), 7 cm (L) 4 - 20 mm 9 steps (4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm), 7 cm (L) 4-32mm 15 steps (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32 mm), 10 cm (L) Scope of deIivery: 1 x twist drill 4-12 mm 1 x Spiral Grooved Drill Bit 4-20 mm 1 x 4-32 mm twist drill