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Your Series 4 UP cutter only scores as well as its wheel. The Sigma 14U is the 12 mm tungsten-carbide replacement that keeps it laying down clean, uniform score lines for reliable snapping with reduced chipping — the fix when breaks start getting ragged.
It fits all Sigma Series 4 "UP" pull cutters (4BU, 4CU, 4DU), and you can choose the 14U standard wheel or the 14UT titanium-coated version for extended life under heavy daily use. Pair it with the Series-4 Pull cutter to keep it cutting like new.
Pro tip: If you cut a lot of hard porcelain, the titanium-coated 14UT pays for itself in fewer swaps. Replace the wheel at the first sign of pressing harder to get a break, and keep the holder clean for a true line.