Description:Brand new and high qualityMaterial: HSS 4241, Titanium Coated Suit for: Steel,Brass,Wood,Plastic(hardness under 25 artifacts, thickness of plate under 5 mm)Cannot be used for stainless steelSize:3/16-1/2'': 3/16'' (4.76mm), 1/4''(6.35mm￡?, 5/16''(7.94mm), 3/8''(10.35mm), 7/16''(11.11mm), 1/2''(12.7mm)1/4-3/4'': 1/4'' (6.35mm) 5/16''(7.94mm), 3/8''(10.35mm), 7/16''(11.11mm), 1/2''(12.7mm), 9/16''(14.28mm), 5/8''(15.88mm), 11/16''(17.46mm), 3/4''(19.05mm) 1/8-1/2'' :1/8''(3.18mm), 5/32''(3.97mm), 3/16''(4.76mm), 7/32''(5.56mm), 1/4''(6.35mm),9/32''(7.14mm), 5/16''(7.94mm), 11/32''(8.73mm), 3/8''(9.53mm), 13/32''(10.32mm),7/16''(11.11mm),15/32''(11.91mm),1/2''(12.7mm￡?Package Includes:3x cone drill