ArkHardware 3/16" Eye & Eye Turnbuckle Open Body Precision Cast Sailing Boat Cable Railing Rigging Stainless Steel Type 316 Marine Grade 1 Order= 5 PIECES ArkHardware 1/4" Eye & EyeTurnbuckle open body PRECISION CAST-DURABLE; HIGHER CORROSIVE RESISTANCE A=3/16"; B=2-3/4"; C=3-3/4""; D=5/16"; 1 PC WT=0.10LB Turnbuckle Bodies are UNC Threads; OPEN BODY.WORKING LOAD LIMIT= 320 LBS END FITTING CAN BE SWITCH AS YOU NEED. Stainless Steel Type 316 Commercial Marine Grade excellent for Indoor and Outdoor. Superior strength & rust resistance over grade 304, Galvanized and Cast Iron. Strong and durable.