Replacement Drive Belt for Lortone 33B, 3-1.5B, and 45C Tumblers Replacement drive belt for Lortone 33B, 3-1.5, and 45C Tumblers Keep your Lortone tumbler running smoothly with genuine Lortone parts 4" approximate outer diameter (105mm) 12.5" approximate circumference (330mm) 7/16" (5mm) thick