ArkHardware 1/4" X4" Shoulder EYE Bolt Cable Railing Rigging Hardware Deck Stairs Stainless Steel Type 316 Marine Grade (1/4 x 4 LENGTH- 4 pieces) 1/4" X4" Shoulder EYE Bolt Stainless Steel Type 316 Commercial Marine Grade. No Rust. superior strength & rust resistance over grade 304 & galvanized. 1 ORDER= 4 SHOULDER EYE BOLT + 4 HEX NUT + 4 WASHER. A=1/4". T(THREAD)=4" . L(OVERALL LENGTH)=5.15". B= (Inner Diameter) =0.62" Thread diameter= 1/4". UNC THREAD. WELDED CLOSED. Stainless Steel Type 316 FORMED. Marine Grade Commonly use quick link to attach shoulder eye bolt as a tie down loop on docks or boats.