pair of hinge knuckles 62 on the other brace pivoting about a pivot pin 52 inserted into a bore 64 through all three knuckles configured so as to receive the pin fixably mounted onto one of the braces preferably the brace onto which the pair of receiving knuckles are mounted is a locking pin 54 which serves to lock the braces in their fully opened position the locking pin 54 slides through a pair of locking pin annular collars or rings 56 the locking pin 54 slides into a receiving bore 65 positioned so as to only be able to receive the locking pin when the braces are fully open and extended to a 180 degree orientation with respect to each other the locking pin is illustrated in locked position 58 and unlocked position 60 additionally the locking pin can be spring biased so as to snap into lock position when the locking pin 54 is correctly oriented over the locking pin receiving bore 65 turning now to fig1 there is illustrated in side view a pair of auxiliary brace legs 66 that are additionally available to help stabilize the sawhorse when it is oriented upwards on its lengthwise axis the auxiliary legs rotate partially about points 76 and are stabilized by two hinge brackets 68 that themselves rotate partially about points 72 and 74 and that additionally are limited in their ability to move sideways by having a hinge means at point 72 be fitted into a trough 70 that restrains a.