Suitable for 7×16, 6×10, 6X12, 6X14mm coreless motor or any motor having 0.8mm shaft diameter Outside Diameter(OD) 2.5mm; Overall Length (L) 3.70mm Inter Diameter (ID) 0.8mm Note: Coreless motor shown in picture is not included in the packag       Pacakage includes :- 4 x gear SKU: PG-179 Category: Diy Hx750 Kit