Dutton Lainson Trailer Safety Chain Class 1 24" Coffee Makers With extended durability zones and Size:36L With extended durability zones and updated mesh zones •Adjustable head basket allows the back part of the retention system to be adjusted up and down depending upon your preference and comfort 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