Split Recess J-Block Mounting BlockThe split recessed J-Block mounting block has a patented hinge that allows for ease of installation without removal of electrical receptacles and water faucets. Manufactured with ultraviolet-stabilized color, minimizing the effects of exposure to the elements. Compatible with all siding profiles. Rich textured appearance. Surface dimensions: 5-1/4 IN x 7 IN. Flange dimensions: 5-7/8 IN x 7-1/2 IN. J-Channel internal dimension: 3/4 IN adjusts to 1-1/4 IN. Knockouts: Rectangle 2-1/4 IN x 3-7/8 IN.No. MBLOCKR PW: WhiteNo. MBLOCKR PA: AlmondNo. MBLOCKR EQ: GrayNo. MBLOCKR PC: ClayNo. MBLOCKR A7: TanView Alcoa Home Exteriorss website for details and **information on this product.