Nautilus Designs Barri Medium Back 3 Lever Mesh Task Operator Office Chair With Fabric Seat and Height Adjustable Arms Black - BCM/K610/BK DDOur medium back 3 lever mesh chair packs quite a punch at a great price. Along with its mesh back and contrasting fabric upholstered seat, it features height adjustable arms, fixed lumbar support, a height adjustable back the angle of which can also be adjusted independently and locked in any position. The chair is completed with a hardwearing base and striking back panelling.