This aluminum connector is used to attach two aluminum rods together. 12.9mm inner diameter. Includes two set screws and an Allen key. Additional Info: Lattice Lab Rod Connector Package Size(L x W x H): 2 X 2 X 1 (IN) Categories: Stands And Support, Support Stands HTS Code: 7326.90.8588 UNSPSC: 4.11228e+007 Country Of Origin: INDIA