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Swapped out my old roll and this one seated perfectly on the first try; the knurled surface grabs the wire without slipping even when feeding .035. Grooves for both .023 and .030 mean I can switch between hard and flux-cored without changing parts, which is exactly what I needed for my MIG setup.

The .030 groove handles my flux-cored wire without any slipping, and the knurling really grips it tight even when I'm pulling a long bead. Fed through cleanly on the first try, no birdnesting so far.

Finally got this knurled drive roll to replace a worn-out one on my Miller, and the .023" groove feeds .035" flux-core wire without slipping. Really solid build at 1-3/16" diameter, no more birdnesting.