They are very useful doing some type of DIY , craft project and General Building/Engineering Using, it can be used to drill holes in a variety of surfaces including metal, wood and plastic.
High speed steel,Durable.with Titanium finish which will help them last longer
Pre-drilling holes keeps wood from splitting before putting a screw in it and makes adding hardware go much smoother. Keeps the heads of screws from stripping.
Normally or bits are stored in cases by size and it would be difficult to find the correct drill bit ,this is very easy to choose the correct bit with calipers and we would have checked the diameter before using
Package: 16pc x 1.5mm, 16pc x 2mm, 15pc x 2.5mm, 10pc x 3mm, 10pc x 3.2mm, 8pc x3.5mm 8pc x 4mm, 3pc x 4.5mm, 3pc x 5mm, 2pc x 5.5mm, 2pc x 6.5mm, 2pc x 8mm, 2pc x 10mm(total 99 pieces)