The listing is for One pair of carbon swingarm spools with 10mm mounting bolts ,material: Delrin, with aluminum core for extra strength.
Spool Size: 1.5 inch dia x 2.25 inch Long.
Bolt size; M10x70mm
They will fit for:
Kawasaki Ninja 250 2008-2012
swingarm spools or sliders are designed to protect your swingarm and axle nut during crash, swingarm spools or sliders allows operator to lift the bike with a stand from the spools when changing your tire, or oiling your chain. Most bikes come with pre-threaded holes to allow operator to install the spools