While 2 rod legs are strong enough to support the majority of projects, 3 rod legs add stiffness and stability for large – or heavily used – furniture. We recommend 3 rod legs for the following:Bench / 16"If your bench needs to support more than three people.Desk or dining table / 28"We recommend 3 rods for added stability. However, 2 rod legs are suitable for small desks, as long as the top weighs less than 20kg.Console table or bar / 34" +The longer the legs, the more they flex. For this reason, we only provide our 34 inch legs in 3 rod.