Abracs Cobalt M35 HSS Drill Bit Kit - Set Contents: 1-13mm (0.5mm Increments) - Pack of 25 - [ABR-DBCBKIT25]. Abracs HSS Cobalt Drill Bit Kits include the popular sizes to suit all drilling applications. Supplied in a durable metal case. Cobalt drill bits are made of cobalt steel.Unlike titanium drill bits, they can be sharpened. Cobalt drill bits are very. Hard, highly heat-resistant, abrasive and ideal for drilling through cast iron, stainless steel and titanium.