HSS Twist Drill Bit, DIN338RN Cobalt 5%, 990 Series
HSS twist drill bit DIN338RN, Cobalt 5%, Fully Ground for professional drilling various steel, metal, alloy, iron, stainless steel, inox, etc.
135degrees split point for durable drilling performance with 5% cobalt up to hardness HRC64-68
Four times of tempering guarantee that professional drilling performance for professionals and industrial applications.
