Abstract: An adjustable width wedge clamp apparatus (10) for use in locking channels having different dimensions wherein the apparatus (10) includes a base unit (11) comprising an elongated trapezoidal shaped base member (20) having an angled rear face (24) that slidably engages a complimentary angled face (39) on a wedge element (38) that depends downwardly from the intermediate portion (31) of a wedge body member (30) having a raised collar element (35) provided with a stepped shoulder bore (36) that is dimensioned to receive a locking screw member (40) and an apertured locking disk member (46) that slidably receives a portion of the locking screw member (40) to permit the wedge body member (30) to be laterally shifted relative to the base member (20).