Fulton 44311H0301 Class IV Bolt-On A-Frame Stamped Trailer Coupler (11,000 lbs. Capacity) Designed for use on trailers with 50 degree tongues; bolt on design; excellent choice for trailers with aluminum frames High strength stamped Steel Construction; for use with 2-5/16 inch balls; rated at 11, 000 lbs Wedge-latch' lever style Locking mechanism makes it easy to see when trailer is fully latched; requires hardware to attach to trailer tongue (not included) Durable clear zinc finish for years of corrosion resistant, over the road service 5 year limited warranty