Material: M35/HSS Cobalt; Flute Length: 80mm/3., 1 , Bit Diameter: 10mm/0., 4; Weight: 109g Drill bit set cobalt 19pc 1-10mm x 0.5mm · Ex Tax: £29.75 ; Drill bit set cobalt 25pc 1-13mm x 0.5mm · Ex Tax: £64.95 ; Drill bit set fully ground 19pc 1-10mm... Twist drill bit with round shank, sharp spiral groove. 10.2mm HSS Cobalt JOBBER Drill BIT for Drilling Hard Metals Steel M35 Cobalt Twist Drill Bits High Quality Hss M35 5% Cobalt Straight Shank Twist Drill Bit For Metal Wood Pvc Drilling - Buy 10mm Drill Bit 130mm Length (here is not included), Total Length: 130mm/5., 1; Shank Diameter: 10mm/0., 4 uxcell 10 Drilling Dia 130 Length 35 HSS Cobalt Round Shank Twist Drill Bit 2pcs - Aazon.co Used widely to drill wood, the tough metal and marble, etc. Made of M35, namely Cobalt High Speed Steel, for super abrasive resistance in tough metals.