After a blister pack of 1 drill bit Technic scaled diameter 7 mm, For Fast And Accurate Drilling. Drilling Fast and Deadly Accurate sharpening of the terrace: thanks to the quality hardwood steel HSS and its unique and original "Speed." Long lifespan: thanks to its heat treatment and "Gold" coating. Optimum evacuation and slicing: thanks to its large flute to his control of the laser Depth: thanks to its graduation, this patented technology helps control the depth during drilling.