The Simpson Strong-Tie® G-422 magnetic ring is designed to hold GWL lathing washers to the nose of the G3 gas-actuated fastening tool. This magnetic ring and the lathing washer are used together with the G3 tool to attach lath to the wall surface for overlaying scratch coats, brown coats and stucco. Once the washers are in place on the G3 tool tip with the magnetic ring, the washers attach to the concrete or CMU substrate with gas-driven pins (GDP), which fasten through the washer.