E-Z Blockâ„ Surface Mounting BlockThe 1-piece design can be used after siding installation to mount all types of accessories. Compatible with Double 4 IN or Double 5 IN siding profiles. Manufactured with ultraviolet-stabilized color, minimizing the effects of exposure to the elements. Rich textured appearance. Surface dimensions: 6-3/4 IN x 6-3/4 IN. Projection: 3/4 IN. Knockouts: Round 1 IN diameter; rectangle 2-3/8 IN x 3-3/4 IN.No. EZBLK040 PW: WhiteNo. EZBLK040 PA: AlmondNo. EZBLK040 EQ: GrayNo. EZBLK040 PC: ClayNo. EZBLK040 A7: TanView Alcoa Home Exteriorss website for details and warranty information on this product.