Spiral Groove Step Drill Bit Set, Metric Hexagon Titanium Coated Step Drill Bits for Wood, Metal, Stainless Steel w/ Tool Bag, 3 Pieces

With a unique trapezoidal structure, one drill can open a variety of drills. openings and a trapezoidal drill is leaning on a drill bit. No need to use the center of the head, it is not easy to break compared to the ordinary twist drill bit. On the construction site, trapezoidal diamonds are suitable for various specifications. Compared to ordinary twist diamonds. It is very weak, you can open a beautiful opening without using the center of the center. With a unique trapezoidal structure, a drill can open a variety of holes. openings and a trapezoidal drill is leaning on a drill. Injecting water and cooling drills at work can prolong its service life. The recommended drill speed is 250 to 400 rpm. Product type: stair diamond Material: stainless steel high speed Package includes: 3*drill head 1*drill bag tools