3/16" Screw Pin Anchor Shackle - Stainless Steel Type 316 Stainless steel shackles are great for marine or high humidity applications Stainless steel has chromium present so that a chromium oxide film forms, which is passive This film prevents further corrosion & prevents spreading to the internal part of the anchor shackle Shackle Size: 3/16" ; Screw Pin Diameter: 1/4" Break Strength: 1 Ton; Working Load Limit: 0.325 Tons; Stainless Steel Type 316