This turnbuckle with fork is made out of rust-free and highly polished stainless steel AISI 316 A4. Resistant against seawater and uv radiation. The M12-thread is located in a closed hull. The safety-bolts are safed by 2 clips. Breaking-load: 6000 KG length ( minimum ): 275 mm length ( maximum ): 400 m diameter of bolt: 11 mm