Locking-collapsible saw horse

A lockable tubular steel saw horse scaffold support comprising:

• a plurality of legs, each of said legs having a top portion and a bottom portion
• a first crossbar connecting a first pair of said legs and a second crossbar connecting a second pair of said legs to form bipedal units,
• a top bar having an extension fastened at each end and a swivel point fastened at opposite ends, each of said top bar swivel points being moveably connected to each of said top portions of said pairs of legs forming an A-frame unit,
• a first link fastened at a midpoint of said first crossbar and a second link fastened at a midpoint of said second crossbar, a third link fastened to said first crossbar at a point located a measured distance from said first link,
• a chain having a first end fastened to said first link of said first crossbar, and a second end fastened to said second link of said second crossbar, and
• an arm, said arm having a first looped end and a second hooked end, said hooked end having a kinked protrusion, said arm being permanently and moveably fastened to said first link by said looped end and said hooked end being selectively removably attached to said second link for locking said crossbars in an extended position and removably attached to said third link in a closed position.