ITEM NAME:5pcs HSS CO M35 Cobalt Twist Drill Bits For Metal Steel 1mm 2mm 3mm 4mm 5mm Description Specification: Brand new Material: High Speed Steel / HSS with 5% Cobalt Size: 1mm, 2mm, 3mm, 4mm, 5mm (each size 1pc) High strength and hardness. Easy to use. Durable in use. Suitable for iron, steel, copper and aluminum, tool steel etc. Package included: 5 x Drill Bit Note: Please allow a little size errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same..Material: High Speed Steel / HSS with 5% Cobalt. Size: 1mm, 2mm, 3mm, 4mm, 5mm (each size 1pc). Suitable for iron, steel, copper and aluminum, tool steel etc. 5 x Drill Bit.