310 Series Polyproplylene Shell Star Base Swivel Chair Seat: Heavy duty and static free, high-density polypropylene material with a light grain surface, injection molded into a one-piece shell unit with 17 heavy duty reinforcing structural ribs. The ribbing provides the one of the most durable shells available while giving lateral movement and flexibility. The shell is ergonomically designed with waterfall front and lumbar support which provides for proper posture and comfort. The shell is attached to the frame with steel rivets underneath the seat, which offers no exposed hardware on the surface. Shell dimension is 16.25” high x 16.25” wide x 16.25 deep. Frame: The lower portion of the frame is welded to two (2) 3” X 81/2” 12 gauge plates which are MIG welded to the extra heavy duty 12 gauge seat support plate. All steel frame parts are powder coated black finish. Base Star base is five (5) spoke high strength polymer, with five (5) dual 2” hooded swivel casters. Color - Black. Height: Swivel pneumatic lift mechanism adjusts the seat height from 15” to 20” on the SC310 and 20”-28” on the SC310L. Options: Seat and back pads, lab foot ring, bell glides Standard Frame Color: Black and Black Diamond REVISION: DATE: