Kato 2-852 HO Scale UniTrack #4 Manual 21-5/8" Left-Hand Turnout Kato HO Left-hand Turnout with 555mm (21 5/8") Radius Curve. Kato's line of ground level UNITRACK offers a variety of pieces and turnouts to allow you to build any layout your heart desires, all while ensuring track quality and steady delivery of electricity to your locomotives.