The Reflect Single Mini Yoke comes with 2 Sliders attached so you can attach it to the top rail or the two smaller side rails. The Single Mini Yoke can slide to any position then can be locked down with the finger screws. The Single Mini Yoke is hinged so the Reflect fixture can be positioned at any angle and safely locked in place. You will need one for for the 1'; 2'; 4; and 2 for the 6' and 8'.