Specification:Name: Black 45# Steel HTD3M Timing Pulley Synchronous WheelMaterial: 45# Steel Surface Treatment: Blackening and Anti-rust TreatmentType: AF TypeTeeth Pitch: 3mmTooth Shape: Arc ToothTeeth Number: 20 21 22 23 TeethRound Bore: 4/5/6/6.35/8/10/12mmKeyway Bore:8mm-keyway 3mm10mm-keyway 3mm10mm-keyway 4mm12mm-keyway 4mmSlot Width: 11/16mm (suitable for timing belt width 10/15mm)Bore Tolerance: 0.01-0.02mmApplication:Suitable for transmission componentsNote:Due to varied batches, the scale of the timing wheel flange will be 2-3mm different, for the installation of adequate area does not influence the use of equipment, the explicit object shall prevail.Package:Packing : Plastic bag / Carton box.Quantity : According on your Choose!