Spacer - Wheel - 1.50" - 4/110 They extend wheel width for greater stability and increased safety. Riders of tall AT will feel much more comfortable on side hills with the wider base, They allow the installation of larger, aftermarket tires without rubbing shocks, struts or exhaust systems, Machined from aircraft grade 6061 billet aluminum and use grade 8 studs, Increases your stability and gives you a more aggressive look