Insert for 9mm, 2ml screw vials, 250ul, 6 x 29mm, precision point with spring, pk 1000: Clear Glass: 226-50524-00: Insert for 9mm, 2ml screw vials, 250ul, 6 x 29mm, flat bottom, pk 100: Clear Glass: 226-50524-10: Insert for 9mm, 2ml screw vials, 250ul, 6 x 29mm, flat bottom, pk 1000: Clear Glass: 226-50525-00