Check the listing for details. Forstner Drill Bit 5/16"(8mm) Dia Woodworking Drilling Hole Saw Tool. Condition: New. Listed at 11.19 USD. Drilling Diameter: 8mm / 5/16"Shank Diameter: 8mm / 0.31"Total length: 93mm / 3.66"Material: 45# High Speed SteelSurface Treatment: PolishedHandle Type: Round ShankProduct Style: Single-tooth Flat-wing Drill BitPackage Includes: 1pc x Forstner Drill BitThis Forstner drill bit is made of selected 45# high-speed steel, which has high hardness and excellent wear resistance and can maintain a good hole-opening effect after repeated use. In addition, when the high-speed steel woodworking drilling tool rotates at high speed, it can withstand high temperatures and is not easy to deform, ensuring the accuracy and stability of the hole-opening.Our woodworking single-tooth flat-wing drill bits adopt the design of alternating left and right beveled edges, which are efficient and durable, fine drilling.