material:high speed steel
.Hex Titanium Passo Cone Broca 4-22 MM Hole Cutter HSS 4241 Para Sheet Metalworking Perfuração De Madeira Ferramentas de Poder de Alta Qualid hex titanium step cone drill bit 4-22mm hole cutter hss 4241 for sheet metalworking wood drilling power tools,size: 4-22 mm(6,8,10,12,14,16,18,20, 22)mm shank:6mm(dia),25mm(l) total:75mm(l) allow 1-3mm measurement error.