ST03-10- 10Pack: 3/16, 3/8-24, 3/8 Hex Fitting; Inverted
ST04-10- 10Pack: 1/4, 7/16-24, 7/16 Hex Fitting; Inverted
ST05-10- 10Pack: 5/16, 1/2-20, 1/2 Hex Fitting; Inverted
ST06-10- 10Pack: 3/8, 5/8-18, 5/8 Hex Fitting; Inverted