A small Bevel Gear + a large Bevel Gear combined use: The combinations are (1 Mod 15T + 1 Mod 30T), (1 Mod 20T + 1 Mod 40T). Number of tooth: 15T/20T/30T/40T. Gear Module: 1 Mod. Bore: 5mm 6mm 8mm 10mm 12mm.
eBay