Octura 1/8" inner diameter x 3/16" outer diameter sleeve bushing. Commonly called bearings, these lead sleeve bushings are impregnated with teflon for a smooth and slick surface. These will fit the Octura 1/8" struts for use with 1/8" prop shafts. (5) Bearings per pack. Specs: .125 : 1/8" (3.175mm) inner diameter. .187 : 3/16" (4.75mm) outside diameter..187 : 3/16" (4.75mm) long.