Turnbuckle Eye & Hook - 6mm - Stainless Steel Marine Grade 316 Stainless Steel 6mm Eye & Hook Turnbuckle. Used for a wide variety of commercial tensioning applications. 6mm European Style Open Body Turnbuckles - Stainless Steel Marine Grade 316 material. Complete with locking nuts. MSRP: Was: Now: $4.79 Add to Cart