Ncstar VMKMBA Vism Low Profile KeyMod Sling Stud/Bipod Adapter for harris style bipods mounts on 2 KeyMod slots on your hand guard. Great for adding a sling swivel stud to your KeyMod handguard. Sling stud can also be used for mounting bi-pods that use the sling stud mount, like the NcSTAR Precission grade Bipods. Black hard anodized aluminum construction. Length 2.4".