The GT6 Task Office Chair. Specification: 5 year guarantee Black mesh back or upholstered seat and backrest Ratchet back, seat height adjustment Height-adjustable T shape arms Synchro mechanism 5-star black nylon base with hooded castors Seat width : 500mm. Optional Extras: 5-star aluminium base with hooded castors Multi functional armrests. Fabric Suppliers, Camira, Bradbury, Abbotsford, Bute and Gabriel.