Simpson GWL-100 Lathing Washer for GCN-MEPMAGKT, Pkg 1,000The GWL 100 lathing washer is designed to affix lath to a variety of substrates, such as concrete or CMU (concrete masonry unit), when used in conjunction with the GCN MEPMAGKT tool. This is accomplished through the attachment of the washers to the nose of the gas actuated concrete nailing (GCN) tool with the GMR 2 magnetic ring, and the subsequent use of gas driven pins (GDP) to secure the washer to the substrate. The GWL 100 is most commonly used to