ITEM NAME:3PC Flush Trim Router Bits Top Bearing Router Bit 1/4 Shank Woodworking Tool AU.The cutter head is made of high quality hard alloy, and the blade is sharp and smooth. Shank Length: 1/4"(6.35mm). Shank Length: 1/4" (6.35mm). 3 x Flush Trim Bit. Blade Depth: 11.9mm. Blade Depth: 20mm.