3193, 3194, 3195 and 3199 are stackable and can be linked together. Chairs 3185-3199 are also available with swivel base on castors or pads, and the seat height is then adjustable between 385 mm and 510 mm. Chairs with armrests can be fitted with a writing board. High stool 3198, seat with or without upholstery. With gas lift height adjustment and pads, seat height 520 - 730 mm.