Peco OOT21 HO Scale HO 21″ RADIUS TEMPLATE\nThe Tracksetta OOT21 OO Gauge 21″ Radius (533.4mm) Tracklaying Template is part of the Tracksetta system – the easy way to kink-free trackwork and transition curves.\n\nThe Tracksetta templates make the job of track laying easier, quicker and more reliable. Available in eight different radii plus a straight unit.