|Name||Straight Nose Hog Ring Pliers||8 in. Retaining Ring Pliers||6 in. Pliers Wrench with Comfort Grip Handles||Heavy Duty Forged Steel Twin-Force Pliers|
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I'd go with what Channellock says. Although home depot usually gets their info straight from the manufacturer.
Home Depot has them, search for channellock snap ring pliers tips :). You may have to wait for them to arrive, but they are widely available.
I don;t recall but close enough to be able and tap the snap ring with a hammer in place, 3/4 in - 1".