Metal forming block with 1/4-1" round U-Channels/Grooves and a 90° V-Groove on the bottom of the block. It has 6 half round channels used for forming, along with a 90° V-groove on the bottom side for bending. The punches are like hammers each one is made to use with the rooves of the block. Come with 7 hammer- punches which correspond to the grooves of the block. SPECIFICATIONS: - Punch Diameters: 22.03mm x 17.49mm x 15.42mm x 15.40mm x 13.71mm x 10.82mm x 8.50mm - Block Dimensions: 23.95mm x 17.35mm x 16.60mm x 15.05mm x 12.48mm x 7.40mm