Feature: 1. These forstner drill bits have drilling depth of 50mm and can be used with hinge drilling machines to improve processing efficiency. 2. The forstner drill bit can drill a round hole in any direction under the guidance of the round edge. 3. Made of carbon steel material, with good machinability, not easy to wear after long time use. 4. The kit contains 16 forstner bits of different metric sizes, which allows more accurate drilling and high chip removal efficiency. 5. Can be used for various wood, plastic, plywood and other perforated materials, suitable for industrial hinge installation, etc. Specification: Item Type: Forstner Drill Bits Drilling Depth: Approx. 50mm / 2in Bit Size(Metric): Approx. 15mm / 0.59in 16mm / 0.63in 17mm / 0.67in 18mm / 0.71in 19mm / 0.75in 20mm / 0.79in 21mm / 0.83in 22mm / 0.87in 23mm / 0.91in 24mm / 0.94in 25mm / 0.98in 26mm / 1.02in 28mm / 1.1in 30mm / 1.18in 32mm / 1.26in 35mm / 1.38in . Package List: 16 x Forstner Drill Bits16 x Storage Box (Random Color)