Bravo Company's BCM KeyMod Rail Panel Kit"" 5.5"" (5 pack)"" is made to fit ALL KeyMod mounting surfaces with 7 consecutive KeyMod slots. Its ultra-slim and radiused surface 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"""" Width 0.625"" and Thickness 0.100"". They can be cut to any length depending on the user's requirements. Made in the USA with a high-strength polymer material.