LUPULLEY GT2 20T Idler Pulley with Bearing 2GT 16T synchronous Pulley Idler Wheel Bore 3mm 4mm 5mm for GT2 Timing belt Width 6mm powge 8pcs 20 teeth gt2 timing pulley bore 5mm 6mm 6 35mm 8mm 5meters width 6mm gt2 synchronous 2gt belt 2gt 20teeth 20t