The meter base J-Block is designed to mount large accessories such as hose racks and electrical meter bases. Manufactured with ultraviolet-stabilized color, minimizing the effects of exposure to the elements. Compatible with all siding profiles. Rich textured appearance. Surface dimensions: 16-1/2" x 15-1/2". Flange dimensions: 18-1/2" x 16-3/4". J-Channel internal dimension: 1-1/4". Limited lifetime warranty.