The Sealey Jockey Wheel has a steel wheel and is zinc plated for added corrosion resistance.Zinc plated for added corrosion resistanceSteel construction with solid rubber tyreAvailable in 150mm, 200mm and 260mm optionsSEATB371 - Ø150 x 24mm steel wheel, solid rubber tyre and 35mm clamp. Minimum height - 515mm, maximum height - 725mm and maximum loading capacity - 80kg.SEATB37 - Ø200 x 45mm steel wheel, solid rubber tyre and 50mm clamp. Minimum height - 580mm, maximum height - 810mm and maximum loading capacity - 150kg.SEATB372 - Ø260 x 80mm steel wheel, solid pneumatic tyre and 48mm clamp. Minimum height - 630mm, maximum height - 860mm and maximum loading capacity - 150kg.