HSS Steel Large Step Cone Drill Titanium Bit Set Hole Cutter for Metal Lathes Made from HSS steel for strength and wear resistance Titanium coating reduces friction and heat, extending cutting life and maintaining sharpness Large step cone design provides multiple hole sizes in one bit set, speeding work and reducing tool changes Suitable for use with metal lathes and other metalworking equipment for precise hole cutting Delivers clean, accurate holes with reliable performance in metal applications Durable and dependable under typical machining conditions Applications and use scenarios Drilling holes in steel or aluminum workpieces on a lathe, with quick access to multiple hole sizes in a single tool Enlarging existing holes in metal plates or fittings during fabrication or Preparing holes for bolts or fasteners in metal assemblies, improving fit and alignment