ArkHardware 5/16" Hook & Hook Turnbuckle Stainless Steel T 316 Marine Grade PRECISION CAST-5 PIECES 5/16" Hook & Hook Turnbuckle Stainless Steel T 316 Marine Grade PRECISION CAST-5 PIECES A=5/16"; B=4-3/4"; C=6-5/16""; D=9/16"; 1 PC WT=0.38LB WORKING LOAD LIMIT= 850 LBS Turnbuckle Bodies are UNC Threads. OPEN BODY. Stainless Steel T 316 Marine Grade. PRECISION CAST