STA-4 .020 1/2-134IN DIA STA Rugged knot-type construction provides aggressive, high-impact action for severe applications Wire Material: SteelDia.: 4 inWire Size: 0.0200 inArbor Thread - TPI or Pitch: 1/2 in - 13 UNCNo. of Knots: 24Face Width: 1/2 inFace Plate Thickness: 7/16 inTrim Length: 7/8 inSpeed: 20000 rpm [Max]Applications: Roughening, Deburring, Cleaning prior to welding, Rust & Paint Removal, Weld scale and corrosion removalUsed With: Straight Grinders, Bench/Pedestal Grinders, Right Angle GrindersQuantity: 1 per packWt.: 1/2 lb