Can be used with or without filter paper for collecting kidney stones, straining urine or retaining undissolved crystals. The 2" (5.1 cm) diameter strainer section has holes .025" (.064 cm) square. The strainer cup is 1/2" (1.3 cm) deep and fits inside the funnel. The funnel fits vessels with a neck opening from 1/4 to 1 7/8" (.64 to 4.8 cm).
