Halfround, V-shape, square, flat and U-shape grooves. 8" long. Rounds 1/16 - 3/4 - 16 depression. 1/2 round 1/16 - 7/8 - 21 channels. V-shape 1/16 - 1/8 - 3 channels. Oval 1/4 x 1/2 - 5/8 - 11/2 6 depressions.