This is a set of power tools including 13 drilling bits and 4 chisels in different sizes and shapes.Drilling bits and chisels are made of high quality 40CR steel for high hardness, durability and long service life.All are well packed and assorted in a plastic box for convenient carry and storage.They are great tools used with electric rotary hammers used for concrete drilling or grooving.If you works in building, construction site or interior finish, this is a very useful tool set for you to have.Specifications:Material: 40CR steelShank Diameter: 10mmSize:Hammer Drill Bit:5.5mm, 6mm x110mm,5.5mm, 6mm, 6.5mm, 7mm, 8mm x 160mm,10mm x 160mm (2pcs)14mm x 210mm10mm, 12mm, 16mm x 260mmPoint Chisel:14mm x 250mmFlat Chisel: 14mm x 250mm x 20mm14mm x 250mm x 40mmGroove Chisel:14mm x 250mmPackage Includes:13 x Drill Bits4 x Chisels