1,DOVETAIL SHAPE: Designed in dovetail shape, this woodworking router bit is specially used for wood grooving, ideal for wood crafts making. 2,1 or 4 SHANK: With standard 6mm 1 or 4in shank diameter, this wood grooving bit is easy to connect with electric tool. 3,TUNGSTEN STEEL ALLOY MATERIAL: Forged by tungsten steel alloy, treated with PTFE coating, this router bit has strong abrasion resistance, very sturdy. 4,SHARPLY BLADE: Highly hard and sharply, the cutter blade could remove wood chips quickly, greatly improves the working efficiency. 5,EASY CARRYING: This grooving router bit cutter is small in size, very convenient for carrying around, perfect for outdoor working. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.