Stackable up to two units high in order to reach a range of 18 ft. Suitable and safe for all types of interior work. Each end can adjust separately to be used on both level surfaces and stairways. At 31 in wide, it can roll through doorways. Platform height adjusts at 2in increments from 28 to 71-1/2 in double prong spring-loaded locking mechanism. Deck braces allow movement over lower obstacles. Assembled size 75-3/4 x 31 x 76 in. Weighs 165 lb. From 29 to 71-1/2 in working heights. Powder-coated. 19/32 in plywood, slip-resistant platform. 6 in double locking heavy-duty. Meets ANSI, OSHA and CSA standards.