The Primo Mini Twist Drills, item number 28-0688, are great value.  These titanium coated cobalt twist drills are available in a variety of shank sizes. The Primo twist drills are ideally suited for use with a chuck handpiece. The average life with Primo twist many is five to six times longer than normal HSS drills, and three to four times longer than non-coated drills saving you money in the long term.   And because the titanium coating provides smoother drilling and less friction with less breakage on uneven surfaces, you save time and avoid frustration.  We offer the 10 most popular sizes with five drills available in each size, so you'll have an ample supply the drills you need.  And remember our Tools Tech Team is here to answer any tools related questions you might have. You can reach them an extension 4300.