This set of 8 bolt hole swivel casters will be the perfect accessory for small equipment and furniture like workbench, trolley, coffee table, plant stand, bookshelf, shopping cart, etc. These casters are made of TPR (thermoplastic rubber) which is distinguished by a good shock and vibration resistance, enabling these casters to run smoothly and quietly. Additionally, their soft surfaces effectively protect your floor from scratching. Besides, the zinc-coated iron frame is highly rust-resistant and thus adds to the catser's sturdiness and durability. Each caster has a maximum loading capacity of up to 132.3 lb. Delivery includes 8 bolt hole swivel casters. Colour: Grey Material: TPR (thermoplastic rubber) and zinc-coated iron Caster diameter: 3.94 " Caster width: 1.06 " Bolt hole diameter: M12 Construction height: 5.00 " Maximum loading capacity: 132.3 lb (each caster) Delivery includes 8 bolt hole swivel casters California Proposition 65