Wooden Swage Block U-Channel Forming Dapping Wooden Block with Hammer Punches Set Made of smoothly finished hardwood, this U-Channel Hardwood Block includes six hammer punches with corresponding head diameters to work with the six u-channels in the block. Widths of U-channels and hammer punches measure: 25, 22, 18, 16, 13.5 and 11 mm. On the reverse side is a 90° V-groove which is perfect for forming angles. Width of v-groove is 10 mm. Great for Silversmiths, Goldsmiths, Jewelers, Crafts and other hobby work. Weight - 12 oz Wooden Block Measures Approx. 6" Long x 2" Wide Essential for Jewelry Repair and Jewelry Making. Made in India.