The ergonomic design of the 425 stool features a contoured seat that molds to your body shape, making it the most comfortable stool you will ever sit on! A simple lift of the hand ring pneumatically adjusts the seat height, allowing you to find your most comfortable working height effortlessly and efficiently. Plastic covers hide the steel substructures and five-leg caster base to provide a warm aesthetic appearance. The 425 redefines the expectations of healthcare professionals. The 427 Features same as the 425 stool, but with a foot lever instead of a hand ring. A touch of your heel to the foot lever pneumatically adjusts the height, allowing you to maintain a sterile field. The 427 is shown with optional back kit that adjusts in, out, up, and down; and, optional arm kit that adjusts in, out and angularly. Contoured seat molds to body shape. Hand operated or Foot Operated. Steel five-leg caster base.