All Jones H-Bars use a 31.8mm stem clamp diameter, 22.2mm clamp size for controls (standard mountain bike style).
All my bars are H-bars. H-bar for Handle-Bar. They have the 45 degrees of sweep, the 0.5" vertical offset, and a multitude of hand-positions. But could I offer more, with less? Yes. Back to basics, back to the beginning, with a twist. Well, with a bend....the Bend H-Bar. The original concept, the 45 degrees of sweep but with the bend, where it is, ensures shifters and levers are a simple fit and the one piece butted aluminium construction delivers a bar 170g lighter than a Loop. Less hand position options, less stuff-mounting space, marginally less stiff but all you might ever need in an H-Bar. No more, no less. The Jones Bend H-Bar.
The bikes I ride for long distances or at night have the Loop H-Bars so I have more hand positions and mounting points. The Bend H-Bar is nice for bikes that don't need things attached to the front of the bar (light, GPS, etc.) or an aero position. I am using the Bend H-Bar on my single-track day riding bikes and it's great.
For setup tips, check out the H-Bar Manual!