Open Body 316 Stainless Steel UNF inch threaded modular rigging screws.↵Turnbuckle components must be purchased separately in order to compose the desired combination.↵ L = Left Thread↵ R = Right Thread↵↵Thread diameter: ↵1/4 = 6.3 mm ↵5/16 = 7.9 mm ↵3/8 = 9.5 mm ↵1/2 = 12.7 mm