Alba Racing billet aluminum 2.0" rear wheel spacers (pair) add 4" width with 4/110 bolt pattern and 81mm hub bore, compatible with KFX 400 and KFX 450 and additional models; manufacturer part number WSU-110-2.0-B10X2. These silver anodized spacers weigh 1.975 lbs each, include 10mm x 1.25 plated studs and plated nuts, are durable and easy to install, and carry a 1 Year manufacturer warranty plus a lifetime warranty on the spacer body.