Features [T SLOT DESIGN] The reversible glue joint router bit is square tooth T slot design, suitable for woodworking mortising and splicing. [TUNGSTEN CARBIDE] The tungsten carbide blade can cut the material smoothly, and the cut is clean and free of debris. [EASY OPERATION] Can create a perfect joint with one cutting side facing up and the other cutting side down, easy to operate. [1/4IN ROUND SHANK] With standard 1/4in round shank, it can be used for desktop woodworking engraving machine. [45 STEEL BODY] 45 steel milling cutter body, with higher strength and better machinability, wear resistant and durable. Specification: Item Type: Reversible Glue Joint Router Bit Material: 45 Steel + Tungsten Carbide Application: Used for woodworking mortising and splicing or other woodworking Surface Coating: PTFE coating Shank Type: 1/4in Round Shank Package List: 1 x Router Bit Package List 1 x Router Bit