This Irwin 10503992 Turbomax HSS Drill Bit Set has jet point tips, designed primarily for high performance drilling in sheet metal, however they also perform well on all types of wood, plastic, and stainless steel. They have a 100° tip for a faster start, precise centering, and guidance with a 140° cutting shoulder for a smooth finish which will drill perfectly round holes, with clean exit holes, and will not bind on multiple layers of thin material. Set of 15 HSS Turbomax Drill bits - 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9 and 10mm.