The rail panel kit is ultra-slim and has a radiused surface that allows a round handguard feeling from an Octagonal profile. It has an aggressive non-slip, non-reflective surface and is ventilated for cooling. The measurements are-Length 5.550 inches Width 0.625 inch and Thickness 0.100 inch. They can be cut to any length depending on the user's requirements. Made in the USA with a high-strength polymer material.