Two pulleys with different tooth number in one piece for two way different ratio power transmission
Tooth profile: 2GT
20 tooth n 40 tooth
20 tooth n 60 tooth
24 tooth n 48 tooth
24 tooth n 72 tooth
For 6mm or 10mm wide 2GT timing belts
2GT-20N40-6B-7 stand for 6mm bore 20 tooth and 40 tooth pulley 7mm wide tooth for 6 or 6.35mm wide belt.