These Bostitch hardwood flooring staples are made of 15.5 gauge high-tensile galvanized steel. These staples are primarily used for hardwood flooring applications to concrete or radiant flooring, engineered for maximum holding power to help prevent floor squeaking. The coated finish eases penetration and increases holding power, and the chisel point preserves the appearance of the work surface in finish applications. Use with Bostitch tools MIIIFS, BTFP12569.