Description: Screw pin bow type anchor shackle Marine grade, high polished and smooth contours Heavy-duty construction, strong, durable and does not rust Used as a connector between anchors and anchor chains Great for various marine and industrial applications Size Chart: Size Length Width Diameter M4 24 18 4 M5 32 25 5 M6 40 30 6 Unit: mm (1mm=1/25 inch) Package Includes: 3 Pieces of Bow Shackle