These cutters are ground to any size your valves are with a bit oversize for piston rock & valve flex. The rods fit your guide diameters as 7 m/m,8 m/m, 5/16",11/32", & 3/8" Diameters. We also have a 3/4" shank too for the mill !They spin freely with a 3/8" electric drill and fit up in the seats to start.
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