Abstract: The present invention 10 discloses a clamp apparatus designed for attachment to the edge of a planar surface 12 which enables various stanchion items 14 to be attached such as a canopy, signs, umbrellas, displays, lighting and the like. The present invention includes an adjustable clamp assembly 40 for attachment to a planar surface and a stanchion holding member 19 having a stanchion bore 20 passing therethrough for receiving a stanchion 14 that is selectively positioned and locked in place by a cam lever 22. The clamp assembly 40 attachment includes a clamp frame channel 28 in which a pair of threaded retention knobs 24 are held captive in the lower lip of the channel portion. The threaded retention knobs 24 and cinch fingers 27 are the means of clamping the device to the planar surface 12. The head 42 of the cam lever 22 mechanism partially extends into the stanchion bore 20 when in the closed position thereby releasably gripping the stanchion 14 between the cam lever head 42 and stanchion bore wall 46.