Ergo M-LOK WedgeLoK Slot Cover Grip, Olive Drab Green, Pack Of 4 Attach the Ergo Grip WedgeLok Slot Cover Grip to your M-LOK hand guard for a positive, non-slip grip area, giving you effective muzzle control even with wet hands. They are heat resistant and constructed from Santoprene, and feature a low profile with an aggressive texture. Each panel covers four M-LOK slots. They measure 6.25" long by .625" wide and are supplied in a pack of four.