With this connector kit you can configure T track in four directions, greatly enhancing the versatility of your T track when using jigs, fixtures and slider bars. Stop blocks and hold downs can be used almost anywhere on your table. This 4 way kit is specifically designed for use with industry standard 19mm T tracks, with a lower 24mm wide T slot for use with industry standard slider T bars. It has an external measurement of 31.1mm wide by 13.1mm deep.