Purchase orders accepted — commercial-grade seating from Perch Chairs & Stools, since 2003. The Perch Sit Stand Stool supports perching between sitting and standing at workbenches, standing desks, production lines and lab stations. A one-touch pneumatic lever sets the seat anywhere in the 21"-31" height range, and the seat tilts forward 3-11 degrees for a supported lean. The high-strength polyurethane seat sits on a durable 5-leg fiberglass reinforced nylon base with stationary caps, so the stool stays where you place it. Commercial grade seating from Perch Chairs & Stools - Trusted Since 2003. Purchase orders accepted.