Match your stainless steel proof coil chain to our stainless steel anchor shackles.To prevent accidental opening, when you attach your anchor to its rode with a West Marine Stainless Steel Screw Pin Anchor Shackle always seize the shackle pin with safety wire. For increased strength, use one size larger than the chain, especially with High-Test chain (the pins will still fit).#316 stainless steelOversized pin is 1/16" larger than the shackle size6:1 safety factor