the present invention clearly any suitable type of step may be mounted between the side rails of side rail pairs 12 15 of sawhorse 10 as previously indicated side rail pairs 12 and 14 may be vertically extended and locked in increments which correspond to the holes 32 formed along the outer edges of side rail pairs 12 and 14 as will be hereinafter more fully described locking mechanisms such as that generally designated at 56 are mounted on each of the side rail pairs 13 and 15 since each of the locking mechanisms 56 are identical for ease of illustration only the locking mechanism 56 associated with side rail pair 13 will be described with reference to fig4 it will be seen that locking mechanism 56 has two handles 60 and 62 handles 60 and 62 have pins 64 and 66 which project through openings 68 and 70 in the side rails of side rail pair 13 shafts 72 and 74 extend from handles 60 and 62 through openings 90 and 92 provided in end caps 26 and into the hollow 88 of the step 23 shafts 72 and 74 project through nylon grommets 76 and 78 nylon grommets 76 and 78 are secured by retaining pins 77 and 79 formed on end caps 26 flanges 80 and 82 are formed at the ends of shafts 72 and 74 for purposes of retaining springs 84 and 86 as described further below as shown by handle 60 at the left.