The Rex ORF-1 O-Ring Fixturing Set, Measures O-Rings 1/16" - 1/4" is designed to enable the user to check o-rings with the combination of an A-scale Rex Durometer and a operating stand. The set consists of five fixtures and one set plug (for setting operating stand travel). The standard O.R.F.-1 set can be used to test O-Rings with cross sections of 1/16", 3/32", 1/8", 3/16" and 1/4". Custom and metric o-ring fixtures can be special ordered.