ITEM NAME:2 Pack Woodworking Tool 5/8, 3/8-inch Dia. Cutter 8mm Straight Shank Core Box Description: Core box bit is designed for reeding, fluting, 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.Cutting Length: 8mm, 14mm. Core box bit is designed for reeding, fluting, sign making and general round nose grooving. It is especially effective in fluting flat surfaces. Number of Flutes: 2. The color may be different for different display, pls understand.