Stepless Ear Pinch Clamp, Stainless, 0.764 - 0.890 Inch Clamping Range, 0.276 Inch Width

That measurement falls comfortably within the clamping range on this one, which runs from 0.764 to 0.890 inches. At .840 you have got room on both ends, so it should seat well. One thing worth knowing on the install side: when you crimp it down, you want to see roughly a 1/16 inch gap remaining in the ear after pinching. That little bit of tension is what gives it a spring-like grip against pressure, vibration, and any shrinkage the hose sees over time from heat cycles.

For a 7/8 inch line, the key is the actual outside diameter. This clamp’s working clamping range is 0.764 to 0.890 inches, with a nominal size of 0.875 inch, so it fits as long as your hose or tubing OD lands in that range.

Oetiker recommends using their own pincers or a similar style approved by them to make sure these clamps get a proper grip.