U-Channel Dapping Forming Block Hammer Punch Metal Steel Shaping Grooved Form BRAND NEW U-Channel Forming Block 6 round channels and one 90 V-groove on the reverse side. 6 Punch/hammers diameters: 3/4'', 5/8'', 1/2'', 3/8'', 1/4'', 1/8'' Block overall dimension: 2-1/2''L x 6-3/8''W x 1''H Quantity: 1 ; Unit approx. weight: 4.5 lbs