Common bore diameters are φ90, φ115, and φ135.

The industry standard is φ90.

φ135 is commonly used for temporary anchors these days.

Also, since this is strictly the nominal diameter, the circumference of the casing rod will be larger, and

The bore diameter will be larger than that.

Nominal Diameter ⇒ Measured Diameter ⇒ Drilled Diameter

φ90 ⇒ φ96 ⇒ φ102

φ115 ⇒ φ118 ⇒ φ125

φ135 ⇒ φ133 ⇒ φ140

φ140 ⇒ φ146 ⇒ φ157

φ165 ⇒ φ165 ⇒ φ172