Made of HSS and coated with titanium, the drill bits are solid, resistant and durable The 1/4" hexagonal shank fits most cordless screwdrivers The tip with a self-centering function prevents it from moving when drilling. age Can drill into sheet metal, steel, copper, brass, aluminum, plastic, plexiglass, wood, PVC, etc. Ideal for professional and amateur DIYers Feature Solid HSS drill bits Provides a long service life. Coated with titanium, they are resistant and durable. Ideal for drilling in sheet metal, steel, copper, brass, aluminum, plastic, plexiglass, wood. , PVC, etc. The self-centering tip helps the bits avoid moving when drilling. The 1/4" hex shanks fit the cordless screwdriver. Specification Material: HSS, titanium coated Shank: 1/4", Hex Size: 1.5mm/2mm/2.5mm/3mm/3.2mm/3.5mm/4mm/4.5mm/4.8mm/5mm/ 5.5mm/6mm/6.5mm Package Included 13 x Twist Drill Bits