Tuff-Seal™ RSR series aluminum cord grips are UL Listed and CSA Certified for use in both indoor and outdoor applications to prevent cable pullout, control arc of bend and to provide a tight seal against environmental elements such as dirt, moisture and coolants. The breadth of the line encompasses conduit sizes from 1/4 - 4 in with fittings offered in machined aluminum, nickel-plated aluminum, steel, stainless steel, nylon and Valox®. A unique design with a combination tightening surface that includes both a hex area and a knurled surface Anti-friction washer that fits between the nut and bushing for easier compression