3 in. Medium Duty Gray TPR Swivel Plate Caster with 175 lbs. Weight RatingMedium Duty casters are used for projects that require a higher weight capacity in varied settings that require a cushioned yet durable wheel. These casters work well on hard and soft surfaces as well as in situations with water, oil and chemicals. They are durable and made of a synthetic material that can be used in institutional settings as well as in the home. 3 in. Dia 175 lbs. weight capacity per caster Plate attachment with 5 16 in. screw hole