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". No. METER PW: Surface Dimensions: 16-1/2" x 15-1/2", Flange Dimensions: 18-1/2" x 16-3/4", J-Channel Inside Dimensions: 3/4", Material: Vinyl, Color: White No. METER PC: Surface Dimensions: 16-1/2" x 15-1/2", Flange Dimensions: 18-1/2" x 16-3/4", J-Channel Inside Dimensions: 3/4", Material: Vinyl, Color: Clay