The inner sleeve is three inches wide and has a bore of 5/8 inch. This single poly bushing kit comes with two bushings and one inner sleeve. The inner sleeve is three inches wide and has a bore of 5/8 inch which gives you a very thick wall thickness that will not become egg shaped with hard use. This kit will fit in a 1 1/2 inch inner diameter tube. * Upon installation Poly bushings will not touch.