Abstract: A clamp for holding work pieces in assembled relationship for welding and the like comprising a pair of discrete posts and a transverse member, as fabricated preferably of bar stock. Each of the pair of posts pivotally mounts a magnet at the lower end thereof and cooperative interengagement expedients are provided on the posts and transverse member to permit of interengagement in preselected relationship. A threaded hold-down member is adapted for mounted disposition upon the transverse member in predetermined relationship thereto.