This item is a set of drill bits with different sizes with a carrying case. They are made of high-speed steel, they are sturdy, durable and practical. This special coating gives the bits a very high surface hardness to help penetrate tough materials, makes the bits highly and significantly reduces friction between bit and workpiece. Perfect to drill holes on aluminium alloy, thin wood , wood slices, plastic and other similar materials. Features - ColorBlack - Material: / and Plating Titanium Coated . - Containing sizes: 16pcs x 1.5mm; 16pcs x 2mm; 15pcs x 2.5mm; 10pcs x 3mm; 10pcs x 3.2mm; 8pcs x 3.5mm; 8pcs x 4mm; 3pcsx 4.5mm; 3pcsx 5mm; 4pcsx 5.5mm; 2pcsx 6.5mm; 2pcsx 8mm; 2pcs x 10mm. - Various sizes are offered to meet different needs. Accurate size will do the work well. - Classic high-speed steel construction with titanium coating for capability and durability. - Made of quality , it is wear resistant and . - and . Excellent for DIY, home and general building or engineering using. - for drill and stationary machines. - Note: This item is not suitable for heavy metal drilling. It only suits aluminium alloy, thin wood , wood slices, plastic and other similar materials, not for use on concrete or masonry. Package list: 99 x Drill Bits