The 1000 series rolling ladders are made from 1" steel tubing all welded construction, making them strong and durable. Steps are 7" deep and 24" wide with a 10"top step and an expanded metal grip. Also available with other tread options. The spring loaded 2" casters are used on 1-4 step ladders and Cotterman SafeLock™ is used on 5 step ladders and above. SafeLock Ladders come with 4" wheels, a foot activated locking mechanism with swivel casters, and rigid rear wheels. A gray powder coat is the standard finish. Meets applicable OSHA and ANSI standards. Cal-OSHA models also available. All ladders are shipped assembled directly from the manufacterer and ready to use as soon as it arrives.