I do not have a Squat Rack. Nor do I have the space to get one. This APEX Dip bar attachment custom suits my situation very well. If fits on the REP Fitness Blackwing bench I already own. No modifications were necessary. Still, I drilled a 3/8 inch hole on the left side of the APEX DIP post. Because otherwise, there was no way to engage the REP locking pin. That is the screw-in-pin that engages and locks all attachments to a Rep Blackwing bench. When using the APEX recommended, 75 degrees backpad angle. Gravity alone would have secured this APEX DIP attachment to my REP Blackwing attachment port. But, with a drilled 3/8 inch hole, it felt even more secured using the locking-pin. It probably would fit much better on the APEX Adjustable Bench. But for a bench attachment, the APEX DIP attachment is super stable on the bench I already own. At 6 feet tall, I had no need for the included step-up to begin my dip exercises. If you use this Dip attachment on a REP Blackwing and are shorter than me. You might want something like a yoga block to step up with. I really enjoy this attachment. This is a great investment to me. Super Stable, a nice moderate knurling grip in my hands. The "V" angle is great for my shoulders. As straight angled dip handles, hurt my shoulders. With this attachment. I get much more use of the equipment I already own. I recommend highly this product if you do not have a Squat rack. If you have a Squat rack. The Dip attachments available already for a rack, are superior.