ITEM NAME:2Pcs 1/4 Shank Round Nose Cove Core Box Router Bit Cutter Woodworking Tool Description: Core box bit is designed for reeding, flutingï ¼Å’sign making and general round nose grooving.. It is especially effective in fluting flat surfaces. Steel bits that meet the high demands of Woodworking and Hardware. Industrial Quality Tungsten Car.Core box bit is designed for reeding, flutingï ¼Å’sign making and general round nose grooving. It is especially effective in fluting flat surfaces. Number of Flutes: 2.