See www.rpmpowerequipment.com for more information The following models: PPF-210, PPF-225, PPT-230, PPT-260, PPT-265, PPT-265S, PPT-280 fit chain type: M91VX, 91VX, 91V fit pitch: 3/8" low profile and fit round file size: 5/32". The following models: CS-301, CS-305, CS-306, CS-310, CS-330T, CS-360T, CS-341, CS-346, CS-370, CS-400 fit chain types: 91VG, 91P fit pitch: 3/8" low profile and fit round size file: 5/32".The following models: CS-305, CS-306 fits chain type: 90SG fits pitch: 3/8" low profile and fits round file size: 11/64".The following models: CS-440, CS-450, CS-510, CS-520, CS-530 fits chain type: 33SL fits pitch: .325" and fits round file size: 11/64".The following models: CS-510, CS-520 fits chain type: 95VP fits pitch: .325" and fits round file size: 3/16".The following models: CS-450P fits chain type: 20LPX fits pitch: .325" and fits round file size: 3/16". The following models: CS-670, CS-680, CS-8000 fits chain type 72V, 72LG, 72LGX, 72LPX, 72LP fits pitch: 3/8" and fits round file size 7/32".