Pneumatic Caster Wheel with Rigid Non-Swivel Top Plate  - 8-Inch -  310 lb. Load Capacity  - Air-Filled Wheel Provides a Cushioned Ride & Shock Absorption Best Suited for Outdoor Use Designed for low speed, manually moved applications, best suited for outdoor rough surfaces or grass Safe on Carpet, Concrete, Tile, & Wood Surfaces For Use On: Wheelbarrows, Wagons, Carts, & many other products Top Mounting Plate: 4.53"x3.97" Bolt Pattern: 3.19"x2.85" Bolt Hole: 0.426" Overall Height: 9.85" Includes: (1) Pneumatic Caster, Wheel with Attachment Plate