3/4" Inland Standard Grinding BitInland 3 4" Standard 120Grit grinder bit. More usable diamond makes them longer lasting. Brass cores are manufactured on "Swiss precision" machinery for consistent and accurate tolerances. Look for the distinctive Precision Quality Rings. Bits made today are virtually identical to ones made years ago. This is good news when replacing bits from an older grinder. All Inland bits are measured for trueness before any diamond is applied. This insures that