E-Rigging.com offers Eye x Hook Turnbuckles in Galvanized and Stainless Steel.
Here is the best use cases for the end fittings on this type of turnbuckle:
Turnbuckle Eye End Fittings
Turnbuckle Eye end fittings are the most durable and cost effective ends. Due to their forged permanently closed eye, they are typically used in permanent applications, or in conjunction with a shackle to connect to other fittings. If the load is removed from the eye end fittings, the eye will remain connected securely to the rigging assembly.
Turnbuckle Hook End Fittings
Turnbuckle Hook end fittings are perfect for quick connections on temporary rigging applications. The hook is large and durable enough to connect to many other rigging fittings. The hook end fitting type is not recommended for critical or dynamic applications. If the load is removed from the assembly, the hook end fitting may disconnect from the other fittings.