The ERGO M-LOK WedgeLoK Slot Cover Grips are made to fit the MLOK hand guards. They are made of Santoprene rubber and provide a non-slip gripping surface and protect unused slots from damage. They are low profile with an aggressive texture. Each Slot Cover Grip will cover 4 MLOK slots. There are 4 covers per package. Mfg: Ergo Grips SPECS: Santoprene Construction - Heat resistant - Positive non slip gripping surface - Low profile with aggressive texture - Covers 4 MLOK slots - 6 1/4" long and 5/8' wide.