Ergonomic Multi-Function Drafting Stool with Adjustable Arms * Upholstered drafting stool * Two seat-height ranges accessible with included gas cylinders height extenders - 26" - 30-1/2""H or 22-1/2"" - 27"" H * Adjustable polyurethane arms * Comfortable padded seat and back * Durable designer upholstery fabric * Height-adjustable foot ring * Sturdy five-prong nylon base * Optional black accordion cylinder cover included * Seat size: 18"" W x 16-1/2"" D * Back size: 16"" W x 16-1/2"" H * Arm height: 8-1/2"" - 11-1/2"" H From Seat * Seat height: 26"" - 30-1/2"" H or 22-1/2"" - 27"" H * Overall dimensions: 20"" W x 20""D x 38-1/4"" - 42-3/4"" H or 42-1/4"" - 46-3/4"" H