Hegar Gyneocology Y31.370.01 - Y31.370.25 (1/2 - 25/26 mm dia.) mm dia. Y31.370.01 1/2 Y31.370.03 3/4 Y31.370.05 5/6 Y31.370.07 7/8 Y31.370.09 9/10 Y31.370.11 11/12 Y31.370.13 13/14 Y31.370.15 15/16 Y31.370.17 17/18 Y31.370.19 19/20 Y31.370.21 21/22 Y31.370.23 23/24 Y31.370.25 25/26