Magpul Industries M-LOK Rail Cover Type 1, Fits M-LOK Compatible Systems, 9.5 Length Covers 6 M-LOK Slots, Can Be Cut, Gray MAG602-GRY M-LOK Type 1 Rail Covers are low-profile and light weight covers that install directly onto M-LOK compatible systems. Made of an extremely heat resistant flexible material" these covers offer an enhanced gripping surface. At 9.5" in length they cover six full M-LOK slots but can be cut for customized length or to combine colors. Includes two Covers per package.