Listing is for one replacement bolt that goes into the arms of the classic aerons with the twist lock. It is not for both bolts or entire assembly as those are for reference. Will not work for flip lock arms (newer style classic arm locks). This is not the OEM part as it is flawed and the heads pop off and break. We had these bolts made to replace the old bolt and is 10x stronger than the OEM boot so your arms will not break anymore. Email us for bulk purchase as we can work on shipping discounts.