1Pcs GT2 Pulley 20 With Teeth OR Without Teeth Idle Pulley 20Teeth Timing Gear Bore 5MM For GT2 belt Width 10MM For 3D Printer powge 8pcs 20 teeth gt2 timing pulley bore 5mm 6mm 6 35mm 8mm 5meters width 6mm gt2 synchronous 2gt belt 2gt 20teeth 20t