- NEW ,Schaefer , swivel snap shackle , single block w/becket , part # 504-19 , 6&3/8" o.a. , 2&1/8" width o.a. , 2inch delrin shiv , stainless and aluminum construction , Check out my E-bay store , by clicking on the red icon by my name , Ebay has a pretty good "in store search " , in the upper let hand corner of my store page so stuff is easier to find , I am listing lots of new and used marine gear for the next couple of months . Thanks for looking . Buy with confidence .