This is a pack of two HO Scale Bachmann Adjustable Parallel Track Tool. Space your track the easy way with this handy tool that is designed to keep the same distance between the centers of adjacent and parallel track. You can adjust the distance between the middle of track from 50 mm to 95 mm or from 2 inch to 3.7 inch. Use with both straight and curved track. Rulers on the tools provide measurement in millimeters and inches.