- 2 inch long x 3.5 inch wide bracket kit used with our standard railing kits. maximum profile dimensions: 2.020 inch x 3.520 inch. Corner radius: 5/32 inch. fits externally. extends 1.250 inch over the profile. overall outside dimensions: 3.445 inch x 4.945 inch. the 2 inch x 3-1/2 inch rail kit includes: (2) 2 inch x 3-1/2 inch rail brackets, (8) #10 x 3/4 inch phillips pan head screws, (8) pvc screw hole plugs, (2) self-drilling phillips pan head screws (self-drilling in order to drill into the aluminum stiffener), (2) pvc screw covers, (1) instruction sheet.