This Puncture Proof Wheelbarrow Wheel is for use with Vaunt Challenger Wheelbarrows. Thesolid internal structure no air means that the tyre will not go flat from screws, nails debris etc and still keep its rigidity and strength, making it perfect for removal jobs or sites with sharp terrain. No tiresome puncture repairs or changing wheels mid jobwith this one The simple but effective tread pattern allows for sufficient grip in dry and wet conditions around site, whilst the high profile helps with maneuverability and the 150kg load capacity ensures you no issues. The centre bore of the wheel is 20mm.