Milwaukee 5 Pack - 4 1 2 Hubbed Grinding Wheel For Grinders - Aggressive Grinding For Metal & Stainless Steel - 4-1/2" x 1/4 x 5/8-Inch | 11 UNC | Depressed 5 Milwaukee Premium Hubbed Grinding Wheels | 4-1/2-Inch X 1/4 X 5/8-Inch | 11 UNC - For Metal & Stainless Steel 1/4" Thick Type 27 Depressed Hubbed Grinding Wheel Design For both Maximal Stability & Long Lasting Life Single Step Mount & Grind Wheel without the need for a Grinder Inner Flange or Locknut Engineered in Brookfield WI for Milwaukee 4-1/2 inch Angle Grinders & other 4-1/2 inch grinders with standard 5/8" - 11 UNC spindle thread | Coarse 24 Grit Count For Aggressive Grinding Action Consistent performance from wheel to wheel through superior manufacturing process. Tested for balance, resulting in smooth, vibration free grinding. Milwaukee Electric Tool Corp, Brookfield WI 53005 USA