Heavy duty, top grain leather case with bungee retainer and the AWedge steel swivel belt loop. This case fits Kenwood model TK 21800/TK 3180 Thin Lithium Battery (4-Key). To use the patented AWedge swivel belt loop you must turn the case upside down to take off and it can be inserted back into the swivel belt loop in any direction. Both AWedge Swivel Belt Loop and AWedge Swivel Belt Clip are interchangable. Replacement Belt Loop part #: ZZ3000 and Replacement Belt Clip part #: ZZ3100.