ASNOMY 12Pcs Wire Bore Brush for Drill,5/16″-1-3/16″ Stainless Steel Wire Brush Bore Cleaning Brush Set for Power Drill Cleaning,Abrasive Drill Wire Brush with 1/4″ Hex Shank. [High Quality] The shank of our abrasive drill brush is Nickel plated to ensure its excellent rust resistance and durability.