Uses standard .22 caliber single shot powder loads for fastening applications in concrete and steel. This is a traditional, trigger operated tool that ejects spent powder loads after each shot. The narrow muzzle bushing (5/8") permits access into tight spaces. The low recoil reduces stress on the user for easier operation. The rubber cushioned grip and all-steel construction promote user comfort and tool durability. The simple construction (only two moving parts) make maintenance fast and easy.