annular ring shank nailbalk ringbaulk ringbevel ring gearblocking ringbus topologychrome piston ringchrome ringcompression ringdifferential ring gearDykes ringexpander ringfulcrum ringhog ringkeystone piston ringnetwork topologyoil control ringoil ringO-ringpacking ringphysical topologypiston ringretaining ringringring boltring gaugering gearring groovering latencyring shank nailring spannerscraper ringsealing ringslip ringsnap ringstar topologysynchronizer ringtopology