Slick two wire clamp assembly. # M2755SP
.281" Diameter hole.
Excellent and works as one might anticipate. I might add that ACS also sells a Slick Single Ignition Wire Clamp, Slick number M2754 and Aircraft Spruce part number 08-04392. I replaced my clamps as I discovered that the plastic liner for the clamp over time deteriorates and then with more time, the ignition cable will start to wear thru and then intermittently short to ground leading to a rough running engine. The big problem is with the intermittently, and hence will usually not show on a mag check but upon takeoff or in cruise, then the roughness starts. Also because the problem is intermittent, the affected plug may not foul or at least cleans itself, hence one does not know what the problem is. I found all this out when a fellow aircraft owner, (C-182), ended up first rebuilding the mags, and then upon later installation of two new harnesses, discovered the worn ignition wire clamps.
Yes, it is our part number 08-04392.