New Pneumatic Gas Cylinder for Herman Miller Aeron Chair 2D x 2W x 11H, Black. Product Dimensions: 2″D x 2″W x 11H. Size: 2D x 2W x 11H. Back Style: Solid Back. Product Care Instructions. Unit Count: 1.0 Count. Recommended Uses For Product. Maximum Weight Recommendation: 350 Pounds. Age Range (Description): Adult. Included Components: Gas Cylinder. Surface Recommendation: Hard Floor. Seat Back Interior Height: 450 Millimeters. Furniture base movement: Swivel. Seat Height: 420 Millimeters. Seat Depth: 18.9 inches. Cushion Style: Boxed Edge. Seat Length: 500 Millimeters. Leg Style: Tapered Leg. Arm Height: 620 Millimeters. Reclining Position Count: 1. Number of Height Positions: 1. Chair Backrest Width: 420 Millimeters. Item Weight: 3.74 pounds. Item model number: Cy-OAR. MaterialItem Weight: 1.7 Kilograms. Frame MaterialSeat Material Type: MetalMetal. Listing is for a brand new never used CLASS 4 WITH 400N, office chair seat height adjustment pneumatic gas lift cylinder. 6.0 stroke (seat travel from lowest to highest seatings). Exceeds ANSI/BIFMA5.1-2011 standards, based on the specs of this cylinder, it’s load capacity is 350 pounds. Cylinder Diameter: 28mm (1.1″) Column Diameter: 50mm (approx 2″).