Alpen Cobalt Forte Drill Bit Case 19 Pieces. -Self-centering, thanks to its specially sharpened tip. -Ultra resistant, due to an edge with special nitro-oxide treatment. -Great chip evacuation capacity due to its deeper spiral. -Faster due to the special sharpening of the slot and its tip. -Valid for great drilling depths. -Suitable for construction steels, alloy steels, stainless steel, copper, brass, aluminum and plastic. -Made with cobalt, which is a very hard material, which provides great resistance to breakage and high temperatures. The case includes: > 1 forte cobalt drill bit.0mm. diameter. >1 forte cobalt drill bit.5mm. diameter. >1 forte cobalt drill bit of 2.0mm. diameter. >1 forte cobalt drill bit of 2.5mm. diameter. >1 cobalt forte drill bit of 3.0mm. diameter. >1 cobalt forte drill bit of 3.5mm. diameter. >1 x 4 strong cobalt drill bit.0mm. diameter. >1 x 4 strong cobalt drill bit.5mm. diameter. >1 x 5 strong cobalt drill bit.0mm. diameter. >1 x 5 strong cobalt drill bit.5mm. diameter. >1 x 6 strong cobalt drill bit.0mm. diameter. >1 x 6 strong cobalt drill bit.5mm. diameter. >1 cobalt forte 7 drill bit.0mm. diameter. >1 cobalt forte 7 drill bit.5mm. diameter. >1 x 8 strong cobalt drill bit.0mm. diameter. >1 x 8 strong cobalt drill bit.5mm. diameter. >1 9 strong cobalt drill bit.0mm. diameter. >1 9 strong cobalt drill bit.5mm. diameter. >1 strong cobalt drill bit of 10.0mm. diameter.