Wichard Captive Pin Long Twisted Shackles, locking pin twist shackle 1/4in Stainless Steel Captive Pin Long Twisted Shackle With Self-Locking Pin Size: 1/4" Interior Length (A): 1 3/4" - Interior Width (B): 15/32" - Pin Diameter: 1/4" By Wichard Inc. Model # WIC 1423 - Material: 316L S.S.