Bolt Motorcycle Hardware (DPWM12.20-10) M12 x 20mm Drain Plug Washer, (Pack of 10) Pack of 10; M12 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: 12mm; OD: 20mm Meets or exceeds OEM specifications