Specialized Levo 4 Full Power Range Extender Fly Rods Bone conduction speaker: 101 AN50040100 Bone conduction speaker: 101 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 Plug in the Range Extender and keep going Twist lock it into your Levo 4 bottle cage and go