HSS-R Metal Drill Bit Set (Roll Forged). 13 pieces. The powerful universal drill is a robust spiral drill made of high-speed steel, featuring high elasticity and a low risk of breakage due to its hot-formed production. It is universally suitable for a variety of metals and hard plastics, allowing for precise drilling in iron, steel, non-ferrous metals, cast iron, and hard plastics. The drill diameter increases in 0.5 mm increments from 1.5 to 6.5 mm. This set includes 13 high-speed steel spiral drill bits for handheld and stationary drilling machines, ensuring a long service life and low breakage risk due to high elasticity. It is compatible with all brands of power tools. The set contains 13 HSS-R metal drill bits with diameters: 1.5, 2, 2.5, 3, 3.2, 3.5, 4, 4.5, 4.8, 5, 5.5, 6, and 6.5 mm. Note: The use of coolant is recommended. Safety notice: Please wear safety goggles while using.