Simpson 6x6x6 L-Shape End Column Cap (Right) HDG ECCLR666HDGThe ECCL is designed to provide strong column to beam connections in end of beam applications when two beams intersect in an "L" formation on top of a column. When properly installed, this column cap helps to distribute the load from the beams and provides support for the connection. End column caps are special ordered per specific details from the designer to accommodate the many combinations of beam and post sizes. Model No. ECCLR666HDG Description.