Features:HSS Drill Bit Set For Wood， Plastic and Aluminum， Copper， SteelIdeal For DIY， Home and General Building/Engineering UsingHigh speed steel，Durable.Specification:Material: High Speed SteelSurface : Titanium CoatedHead: HexHead Diameter: 7mmContaining Model:3.0mm， 4.0mm， 5.0mmModel & QTY & Length3.0mm : 5pcs，Length : 78mm4.0mm : 5pcs，Length : 92mm5.0mm : 5pcs，Length : 102mmQuantity: 1 Set (15Pcs)Package included :5 x 3.0mm HSS Drills5 x 4.0mm HSS Drills5 x 5.0mm HSS Drills