25 per pack. .300 head diameter drive pins. Designed for use in concrete and structural steel applications. ITW Ramset powder actuated fasteners are specifically fabricated to meet the exacting requirements of toughness and durability. For use in low-velocity tools. For use in tool model No. HD22, RS22, 721, Autofast, D60, SA270, D45/D45A, Cobra, M70, Hilti, Remington tools, ITW model No. 00022, 40088, 08896, and 16941 tools.