Hanging hole and one end is rounded for safety;The clear black graduations go down to 0.5mm for metric and 1;64 for imperial;The reverse has a useful conversion table for inches to millimetres and also a table of bolt sizes in mm and conversion for the hole diameter for English and American standard bolts;Dimensions - L: 17cm (overall) x W: 2cm

• 6/150mm Stainless Steel Metal Ruler - Conversion Table

6/150mm Stainless Steel Metal Ruler - Conversion TableCrystal Edge Ltd