The inside dim is approx 60", the 81" being the outside dimension of the top piece. Depending on the use it's either a tiny bit small OR it's perfect if you're not after something huge. Quality is decent although there were some reviews that complained of the finish rusting. If it's used outside it's probably gonna rust eventually. Help it out by buying a $5.00 can of paint and giving it an additional coat. It's decent quality for the money and I would recommend it.