Is for specific grinding machine:
Diameter: 78mm, Arbor: 1/2inch (12.7mm)
CBN Grinding Wheels are for HSS (High Speed Steel)
SDC Grinding Wheels are for Tungsten Steel
Model Number : 20G-CBN230
Type : Abrasive Disc
DIY Supplies : Metalworking
name : 3 Inch CBN Grinding Wheel
Diameter : 78mm
Thickness : 10mm
Arbor : 12.7mm
Abrasive : Diamond/CBN
Suitable Models : MR-X1 X3 13A 13B 20G E12 E20