Dutton Lainson Trailer Safety Chain Class 1 24" Shorts Long Range MOA reticle has an 12 speed Shimano MTB Long Range MOA reticle has an ultra fine center area to engage targets with increased detail for long range competition without adding visual clutter Finish First Heavy duty Class 1 welded link chains for trailers up to 2000 lbs Zinc plated finish to resist rust with heavy steel hook and safety clip that latches to keep chains attached to tow vehicle Features a chain size of 3 16 and mounts with 3 8 bolts This product meets SAE and V 5 standards Two 24 chains are included per package NOTE Do not mount chains to trailer tongue with the same bolts used to mount the coupler Cross safety chains under coupling allowing only enough slack for turns