uxcell 1/4" x 5/16" Straight Shank Double Flute Cove Box Router Bit 2Pcs Product Name: Cove Box Router Bit; Material: Metal; Weight: 48g Package Content: 2Pcs x Cove Box Router Bit; Standard: 1/4" x 5/16" Shank Diameter: 6.35mm/1/4"; Cutting Diameter: 8mm/5/16" Cutting Radius: 4mm/5/32"; Cutting Depth: 7.5mm / 0.3" Overall Length: 43mm/1.7"; Color: Silver Tone,Yellow