0.300 head diameter drive pins. Designed for use in concrete and structural steel applications. ITW Ramset power 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, and Remington tools.