Fangrui Product Details Working Load Limit: 2470 Lbs. 4 Pack. Fit: Designed To Work With 5/16inch Safety Chains Or Transport Binder Chain. This Fits Securely On Of A Chain And Can Be Hooked Over A Carabiner For Easy Attachm Ent. Material: Made Of Grade 80 Drop Alloy Steel, Sturdy Construction, Not Easy To Break, And To Use. Easy To Use: Designed For Easy Attachment And Release. They Help You Create A Secure Attachment With A Strong Hook Pin, And Quick Release Cotter Pin. Application: Great For Locking Heavy Cargo And Securing Large Loads In Commercial And Industrial Applications. Please Note: The Physical Slightly Color Difference Or Difference, Does Not Affect The Use, Please Do Not Mind, Thank You! Colour:red Material:alloy Steel Package Contents: 4 X Hook Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.