The Interlok Slider Winders from PRESTON are high quality harness racks that can be used in combination with the Interlok Winder Trays. The harness boards are extremely strong and have sliding attachment points on each side. These can be moved over the full length of the harness rack so that you can easily hook the loop behind it. Available in three sizes: Interlok Slider Winders - 13 cm Red, Interlok Slider Winders - 18 cm Blue, Interlok Slider Winders - 26 cm Green. Always packed per 10 pieces.