Diamond Coated Twist Drills - Straight Shank

These diamond twisted cylinder bits are used for reaming pearls and drilling holes in glass. Because of their twist-shape, these bits drill faster than the above diamond cylinder bits. Twisted cylinder bits are electroplated with #120 industrial diamond powder. Use on a drill press or flex shaft with the proper collet. Tip sizes are approximate. Shank size is slightly smaller than tip size.