This set of 12 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. Half of these swivel casters are equipped with brakes for flexible control. Each caster has a maximum loading capacity of up to 45 kg. Delivery includes 6 bolt hole swivel casters and 6 bolt hole swivel casters with brakes.