4Pcs Rabbet Router Bit 1/4" Shank With 6 Bearings Set - 1/16", 3/16", 1/4", SIZE - Shank Diameter - 1/4",cutting depth (change by replacing bearing): 1/16", 1/8", 3/16", 1/4", 5/16", 3/8", 4 different cutting height: 1/8", 1/4", 3/8", 1/2". MATERIAL - Made of high-quality carbide and Teflon coating, not easy to break. high hardness, wear resistance, excellent thermal stability, good strength and toughness. Its advantages make it cost-effective and high efficiencyc DURABLE STEEL BODY - These router bits made from high-quality alloy blade, makes clean and accurate cuts on all types of wood with excellent resistance to heat. FEEDING SPEED: 8-12M/Min; [Spindle Speed]:18000-24000RPM, please select the correct casing size and use low speed. NOTE - Please check the shank size for your router takes to avoid ordering in mistake.