Bolt Motorcycle Hardware (DPWM8.15-10) M8 x 15mm Drain Plug Washer, (Pack of 10) Pack of 10; M8 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: 8mm; OD: 15mm Meets or exceeds OEM specifications