For CNC and other automatic routers, as well as portable routers for handheld and desktop installations. Such as woodworking engraving machine, trimming machine.Material: high speed steelSurface: Titanium coatingQuantity: 100The size of the drill bit in the set: 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.2mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 8mm, 10mmLength: about 4.2cm, 4.8cm, 5.6cm, 5.8cm, 6.5cm, 6.8cm, 7.3cm, 7.8cm, 8.5cm, 9.2cm, 9.4cm, 10cm, 11.8cm, 13mmfeature:HSS material, strong and durable.Suitable for drilling holes in wood, plastic and aluminum.It is an ideal choice for DIY, home and general construction/engineering use.