5/8" to 1" pin adapter sleeve allows you to use your 5/8" pin attachments on a rig with 1" holes. The adapter is made from high quality materials and machined with tight industry standard tolerances right here in the USA! Coated with clear zinc plating ensures these sleeves will be rust free and last for years to come. This adapter can be used with most weightlifting rigs. Product Features: - High quality construction. - Durable design. - Easy to install and remove for ease of use between 5/8" or 1" hole rigs. - Can be used with most 2"x3" and 3"x3"weight lifting rigs. - Includes two sleeves, four set screws, and an Allen wrench for assembly.