1 1/4" ID high strength split-lock washers. Made of through-hardened steel with a zinc-yellow coating. These premium split-lock washers are made of through-hardened high-strength steel. Split-lock washers decrease the likelihood that your fasteners will come unfastened by adding tension to the contact point. They are commonly used in environments that have lots of vibration or shock. Our split-lock washers have a zinc-yellow chromate finish that provides superior corrosion and rust protection.