Metaltech Multipurpose 18ft. Maxi Square Triple Baker-Style Scaffold Tower Package - 1,000-Lb. Capacity, Model# I-T3CISC Fully adjustable for safe use on stairways Rugged 1 1/2 in. square tube steel frame unit Includes three 71 3/4in.L x 29 3/4in.W plywood platforms with steel-reinforced edges for safety Versatile platform heights adjust in 2in. increments using the convenient spring-loaded locking lever 12 double locking 5in. caster wheels with locking pins offer mobility