2pcs Coupling Hub for 4 mm Shafts Hello Customers, we would like to inform everyone that we will not be accepting orders until we fix the issue of disappearing shipping cost from your orders. We are still investigating and fixing the settings so that the correct shipping cost will be displayed in every order. Thank you very much for understanding » All Products » 2pcs Coupling Hub for 4 mm Shafts This coupling hub allows secure coupling of a variety of mechanisms to 4 mm motor shafts. SKU: JSL13282219971 Price: 9.57 $ Product in stock SSL Certificate Quantity Updating cart... Overview This coupling hub allows secure coupling of a variety of mechanisms to 4 mm motor shafts. Specifications Length: 15.5 mm Inner Diameter: 4 mm Outer Diameter: 22.5 mm Related Products JGA25-370RC DC Gearmotor with Extended Axis (66 RPM at 6 V) JGA25-370 DC Gearmotor (22 RPM at 24 V) JA12-N30 DC Micro Gearmotor (70 RPM at 6 V) JGB37-520 DC Gearmotor (319 RPM at 12 V) JGA20-130 DC Micro Gearmotor (240 RPM at 12 V)