Stainless Steel 8-piece Hegar Dilator Set comes complete with case.
Each double-ended dilator sound gradually increases in size on both ends.
For both beginners and advanced.
Insertable length: 10 cm on each side. 
                                      Total Length: 20.3cm ( 8 inches)
Overall Diameter: 3.5mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm.