SUTTON 11.5mm Jobber HSS-CO HD Cobalt Drill BitSUTTON 11. 5mm Jobber HSS CO HD Cobalt Drill Bit Made from HSS Cobalt The 5% cobalt formula improves abrasive & heat resistance, for increased strength at higher cutting temperatures. 135 Split Point (drills > 2mm & 3 32) Enables accurate positioning and less drilling pressure. Thick Core For increased rigidity in hard materials. Precision Engineered Parallel Shank For accurate hole size.