Loop caps are used for the top rail and line post protection. Usually, it is made of aluminum material in a residential application, while galvanized pressed steel for commercial areas. The post size can be 1-5/8", 2", 2-1/2", 3", 3-1/2", and 4" which will accept round top rail of 1-3/8" and 1-5/8", carriage bolt size 5/16 x 1 1/4" Also, the loop caps can be powder coated black, brown, and green.
√ 1-5/8 in. Line Post Eye Top
√ 1-7/8 in. x 1-3/8 in. Aluminum Line Post Eye Top
√ 1-5/8" x 1-3/8" Aluminum Line Post Eye Top
√ 2" x 1-3/8" Galvanized Line Post Eye Top
√ 2" x 1-5/8" Galvanized Line Post Eye Top
√ 2-1/2" x 1-5/8" Galvanized Line Post Eye Top
√ 3" x 1-5/8" Galvanized Line Post Eye Top