For use in low-velocity tools. Use in tool model No. HD22, RS22, 721, 4170, and M70 Remington and Hilti tools that use single shot .22 caliber loads. High-quality and dependability. All loads are color coded and load level numbered. As thenumber increases, the power level increases. Always start with the lightest load. If the fastener does not set completely, use the next higher load and repeat the process. Brass cased.