This is the classic in design and looks! An excellent shackle for all-around use. These are commonly referred to as a "bow shackles with screw pin" or a "bow shackle with screw collar pin." See below for bow shackle size and capacity as well as other dimensions. Keep several in your ditty bag as spares. All sorts of uses including towing. Outstanding quality and they're inexpensive! 316 Stainless Steel.
All values are shown in inches (or as noted above), except for WLL and WT that are in pounds.