Our range of Swift underslung basins come in 3 sizes. The INTERNAL measurements are as follows:

• Small: 360mm (A) x 310mm (B) - Code: SWUSS
• Medium: 405mm (A) x 320mm (B) - Code: SWUSM
• Large: 520mm (A) x 340mm (B) - Code: SWUSL (White) / SWUSLB (Black)

Remember to cut the granite slightly smaller than the internal measurements of the basin. 15mm smaller should work well.