Xilko 5Pcs 15-35mm Tungsten Steel Woodworking Forstner Drill Bits Set Carbide Wood Drilling Rotary Boring Hole Round Shank Cutting Tools;

Material: Made of tungsten steel; its blade is curved design, cutting resistance is small, cuttings removal is convenient, drilling is good.

Features:

The 2 cutting teeth design creates a professional flat bottom hole and a clear through hole, and 3 burrs prevent the bottom from being torn.

This bit is used for woodworking and is better than a drill and a flat drill. It is far safer and more accurate to use this drill bit in a drill press. 

Precision ground for heavy use and easily resharpened, they can enlarge existing holes with ease and can bore any arc of a circle.

As long as a very clean and precise hole is required, the woodworker can drill without drilling material during the cleaning process and require precise bottom-to-hole drilling. 

There are five sizes: 15mm/0.59" (7.5*1.2*1.2cm), 20mm/0.79"(7.5*1.5*1.5cm), 25mm/0.98"(7.5*1.8*2.0cm), 30mm/1.18"(7.5*2.4*2.9cm), 35mm/1.38"(7.5*2.5*3.3cm).

Important Note:

When you using this drill bit, the materials (eg. wood, plastic products, plywood ect.)temperature will get very high, please add some water or coolant to avoid the material get smoke.