Ronstan Trunnion Snap Shackle - Large Swivel Bail - 122mm 4-3/4" Length. The Ronstan Trunnion Snap Shackle w/ Large Swivel Bail features a cast 15-5PH investment cast stainless steel body and hasp with a 316 stainless steel plunger pin and spring. The larger bail allows for multiple shackles to be added to the security chain to increase security. The snap also allows the security of knowing where the next safety tie is located. The security of knowing where your rope or rope is going to be is an essential part of security. Make sure you have the Ronstan Trunnnion Snap Shackle w/ Large Swivel Bail installed before going out to sea. Specifications for Ronstan Trunnion Snap Shackle: Manufacturer: Ronstan Length: 122 mm Color: Black Size: Large Package Contents: Ronstan Trunnion Snap Shackle Ronstan RF6321: Trunnion Snap Shackle - Large Swivel Bail - 122mm 4-3/4" Length