78mm CBN (cubic boron nitride) wheel is a high-performance grinding wheel used for sharpening high-speed steel (HSS)

and other hardened steel drill bits. With a diameter of 78mm, these wheels are often compatible with desktop drill sharpening machines,

such as the MR-13B, MR-13A, and MR-13D models.

A typical 78mm CBN grinding wheel for a drill sharpener has the following characteristics:
Outer Diameter: 78 mm (3.07 inches)
Arbor Hole (Inner Diameter): 12.7 mm (0.50 inches)
Thickness: 10 mm (0.39 inches) or 15m

Features and benefits
High hardness and durability:

CBN is the second hardest material after diamond, making these wheels highly resistant to wear and ideal for grinding hard steels.
Precision and efficiency: CBN wheels are highly efficient and hold their shape, so they don't require truing or dressing. This ensures a consistent and precise sharpening process.
Low heat generation: They produce less heat than traditional grinding wheels, which helps prevent overheating and damaging the delicate edges of your drill bits.

Dual abrasive options: Many manufacturers offer "CBN/SDC" wheels, which contain both cubic boron nitride and synthetic diamond compound. This allows for the versatile sharpening of both high-speed steel and carbide tools.
Compatible with many sharpeners: They are designed to fit a variety of compact electric drill sharpeners, making them a standard replacement part for many models.

How to order the wheels?

01: please let us know your grinder brand and model.

02: If for HSS or carbide drill bit sharpening.

03: CBN wheels are usual for HSS bits, but the Diamond wheels are usual for soild carbide drill bits.

04: current CBN wheels you use at present.

Wheel package by paper box.