For raising sheet metal into a bowl against a wooden stake or metal T-stake. Can also be used for raising cylinders and concave shapes and planishing subtle concave shapes.  Fretz Hammers feature beautiful and strong hardwood handles, oil finished and tapering to a slender neck for flexibility. Head is cast from 420-grade stainless steel and hardened to 50HRC for maximum durability. Faces measure 23x12mm or 23x9mm and are polished to a mirror shine.  Made in Vietnam.