Office Chair Base and Castor Combo - NOVA Breathe new life into your chair with this base and castor upgrade combo, equipped a brand-new industrial grade nylon base and castors built to last. Now comes in two sizes: 640mm diameter and 700mm diameter variants. Features: Durability Made to Last - Triangular-reinforced base using industrial grade nylon. Professionalism In the Comfort of Your Own Home - Slick and modern design that even the most modern offices would envy. Glide with ease - High quality nylon castors offering the perfect amount of freedom to let you slide around or stay in place when needed. Specifications: Nylon base center with reinforced steel built for durability 50mm nylon castors Total Height of Base Kit: Check individual product images for details. Total diameter of base: 600mm, 640mm or 700mm 12-month warrantee (excluding wear and tear on the surface) Requires easy assembly. What's in the box 1x 5 Star Nylon Base 1x Set of 50mm Nylon Castors