VEVOR 4-Jaw Lathe Chuck, 10 in (250 mm), Lathe Chuck, 0.6-9.84 in (15-250 mm) Clamping Range with T-key Fixing Screws Reversible Jaws, HT300 Cast Iron Material, Internal External for Wood Metal Lathe

I don't see any practical use for a "self centering" lathe chuck having four jaws. The only practical purpose for four jaws is to hold irregular workpieces.