Feature:1. Durable Materials: Sturdy carbon steel body, heat resistant PTFE coating, with incisive blade, bearings will not break.2. Multiple Bearings: Interchangeable bearings can be used to cut notches of different depths, resulting in smooth cutting surfaces.3. Safe Operation: The slot milling cutter bit has anti backlash design, which makes the operation safer and is suitable for various woodworking projects.4. Applicable Boards: Can be used for hardwood, softwood, synthetic board, etc., but avoid processing too hard materials.5. Standard Sizes: Both milling cutter and bearing have standard shank diameters, which is convenient for precise installation and use.Specification:Item Type: 1/2in Shank Router BitMaterial: Carbon steel main body + alloy cutter headShank Diameter: 1/2in, 1/4in(Bearing Shank)Cutter Head Diameter: 1-3/8inBlade Depth: 1/2in6 Bearings: 1/8in, 1/4in, 5/16in, 3/8in, 7/16in, 1/2in.Package List:1 x Router Bit1 x Bearing Set1 x Wrench2 x Storage Box