Troy Bilt Chipper 16 Chipper Shredder Flail Hammers 1900102 Troy-Bilt part numbers: 1900102, 1900102ZMA, MP1900102ZMA, w20307503, 19157002 Fits Troy-Bilt Tomahawk and Super Tomahawk and some Murray chippers and chipper/shredders Use for 8HP and 5HP Chipper Shredder Models Troy-Bilt - 16 Chipper Shredder Flail Hammers 16038e2401288