OO GaugeRatio 546A Rolling UnderframePlastic Kit, Unpainted (Picture shows how the completed kit can look)Paint and glue are NOT supplied with this kit. Technical Specification: Length: 61mm Recommended to be used with: All 1:76 Scale Model Railways and Modelling projects Ratio 545 Lifting Hoist and 546 Traversing Crane To fit under the Ratio Locomotive Lifting Hoist (545) or Overhead Traversing Crane (546) to allow them to run along tracks (not included). The kit makes a pair of rolling underframes. Length 61mm. Brand new item direct from our new Yorkshire model railway shop.