Product Specifications: Quantity: 4 pieces. Drill bit size: 2 mm. The hole diameter is about 2 mm, and the screws are 2.2-2.8 mm. The hole diameter is about 2.8 mm, and the screw is 3-3.5 mm. The hole diameter is about 3.5 mm, and the screws are 4-4.5 mm. The hole diameter is about 4.5 mm, and the screws are 5-5.5 mm. Material: HSS drill bit and electroplated brass body. Drilling depth adjustment. Remove the drill for easy replacement. Hex Shank: 1/4" Features: Click on Edit Design. 1/4" hex shank for fast, one-handed loading and partial out. Spring-loaded external guides with chamfered heads keep high-speed drill bits centered for perfectly piloted holes. Self-centering to prevent half-turns. No sawdust clogging, durable and premium quality. Used by professional carpenters and tradesmen. Product Description: Drill Bit Size: 2mm, 2.8mm, 3.6mm, 4.4mm The drill bit's self-centering feature allows for precise positioning without rotating the hole. Snap-in replacement design. 6.35mm hex shank for quick one-handed loading and partial removal. Holes on the side of the cylindrical drill guard allow for quick sawdust removal without jamming. Convenient and accurate drilling of furniture and door hinge holes. luckymeet