SPROCKET FOR MACHINE SAWS COMPATIBLE WITH MODEL: 20 23 27 2500 2700 3300 3350 3800 3816 3850 4550 i3850bi450b i4550b PS33 timberman UT10901 UT10910 UT10926 BELL INNER Ø: 61. 5mm HOLE ø: 7.5 mm TOTAL HEIGHT: 26.5mm .325" 7 TEETH roller cage: 37325 HOMELITE CODE: 524076 ORIGINAL CODE: AT