This style with an extra wide removable Locking pin on the bottom bar is for attaching traces to your singletree, but can also be used on holdback straps up to 1" wide. This design with the added nut, prevents the bolt from backing out.

The width of the opening that the pin goes through ( measurement C) allows up tp a 1" strap.

This shackle measures 4" in length (D) and has a breaking strength of 2700lbs. The diameter of pin (E) is 1/4".

Inside allowance btw pin bar and bolt head (B) is 3/4"