These 2-piece anti-chafe trim ring assemblies are invaluable for making an attractive and functional marine or rv pass through grommet opening for wiring, power cables, hoses, ductwork, plumbing lines, steering lines, etc. These are the SAME PARTS that the top OEM brand name manufacturers use for boats and other marine craft. These rings are commonly used through cabins as well as below deck. Also used in campers, RV's, buses and even commercial vehicles, machines, and construction equipment. Comprised of two matching pieces that fit tightly together. To install, simply “hole saw” the required hole through the wall or bulkhead, then insert the ring halves from either side. The rings can be glued together to make the installation permanent using standard multi-purpose plastic glue. Once installed, the soft radius of the ring prevents chaffing or kinking and the flanged area makes the installation look professional. The rings fit walls and bulkheads up to 2” thick. Made from high impact thermoplastic with an attractive finish.