Professional drills for commercial or occasional use HSS cobalt drill bit set Precision fully ground tips 135 degree split point tips for perfect centering and reduced drilling pressure 5% cobalt drills (this is the standard content for most cobalt drills) Manufactured to DIN 388 standards Suitable for drilling steel, stainless steel, aluminium, copper etc... Metric size drills SET INCLUDES THE FOLLOWING SIZES • 1.5mm, 2mm, 2.5mm, 3mm, 3.2mm, 4mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm and 6.5mm Comes in a plastic compartment for easy storage and transportation