single operator adjustable parallel bars are platform mounted. One person can change these bars faster than any other manually adjusted bars. A practical alternative to motorized bars. Every height adjustment necessary can be made from a single location. Durable, safe and very simple to use with height and width permanently stamped on frame. Single plunger/lock. Handrail size 1-1/2″. Height adjusts from 31″ to 41″h. 22-1/2″w between handrails.