Bolt Motorcycle Hardware (DPWM10.18-10) M10 x 18mm Drain Plug Washer, (Pack of 10) Pack of 10; M10 aluminum drain plug sealing washers Soft tempered aluminum compresses to seal in fluids Most OEM's recommend replacing sealing washers at each oil or coolant change Dimensions ID: 10mm; OD: 18mm Meets or exceeds OEM specifications