This item is a set of drill bits with different sizes, and each piece is in brass color. Made of high-speed steel, they are sturdy, durable and practical. Perfect to drill holes on aluminium alloy, thin wood , wood slices, plastic and other similar materials. Features - ColorSilver - Material: . - .: 0.3mm 0.35mm 0.4mm 0.45mm 0.5mm 0.55mm 0.6mm 0.65mm 0.7mm 0.75mm 0.8mm 0.85mm 0.9mm 0.95mm 1.0mm 1.2mm 1.3mm 1.4mm 1.5mm 1.6mm - Various sizes are offered to meet different needs. - Made of quality , it is wear resistant and . - for drill and stationary machines. - Accurate size will do the work well. - Note: This item is not suitable for heavy metal drilling. It only suits aluminium alloy, thin wood , wood slices, plastic and other similar materials. Package list: 1 x set of 20pcs Drill Set Drilling Bit Round Dirll with Case