The original Pepin Dumbbells. These are an extremely high quality set of adjustable handles that use a screw to hold your plates on. Pepin makes two lengths of screw based on how many plates you need to fit. The screw design is very sturdy, and you can lock it down tight, but it's pretty slow to adjust as you basically need to make a vertical stack of plates and drop the screw through the middle. The two inch and one inch plate models only differ by having a plastic bushing to align the 2" plate onto the screw. If using more than two plates per side I find it helpful to use an additional spacer to keep the weights aligned.

The Hell Box is an extremely high quality add on for your belt squat. It makes it easier to load and unload plates, as well as improving your ability to maintain balance with the handle while not being able to cheat by pulling yourself up by the handles. I have mine configured to be as close to the end of the lever arm as possible to maximize felt weight, which is about 80-85% of the plate weight. The only disadvantage to that outboard configuration is your knees have to go on either side of the plates when squatting so you'll want thin plates to go heavy. The handle position has a ton of adjustment so it will work for any size person.

The Prime super squat bar is my preferred bar for good mornings. The steel back plate keeps the weight planted on your back and not rolling up you neck when you bend over. For regular ssb squats the shoulder pads are less comfortable when compared to the Rep SSB, being harder and smaller diameter. There's also a decent size gap behind the back of the shoulder pad and the back plate. This means the bar just doesn't work for smaller people like my fiancé.