A replacement drive gear for an old pushed rotary lawn mower, Serva Clipper (may exist under other names), as the gears eventually wear down and replacements are no longer sold. Gears are mirrored left and right. There is also a "fixed" version that does not allow freewheeling. It is made to match the original one as closely as possible, but the gears have been made slightly "fatter" to grip into the ring gear (inside the wheel) better. I printed these in PETT (Taulman T-glase) for some extra strength, but the prototypes in PLA seemed to hold up just fine. Not sure about wear after usage on those though.