swivel lift screws 1. material: forged alloy steel 2. process: quenched and tempered 3. surface: color painted 4. pack: cart Swivel lift screws, forged alloy steel swivel lift screws, lift screws1.forged alloy steel2. quenched and tempered.3. ultimate load is 4 times the working load limit. High quality forged alloy steel swivel lift screws
