Standard Pack = 1 piece(s). Type = Light Duty Brush ; Will Cover IDs From = 1 1/2 To 4 Inch ; Features = Cobalt Base Hard Facing Which Is Flame Coated To The Ends Of Stainless Steel Aircraft Cable, Will Flare Out At 2,000 Rpm For Rust And Scale Removal From Pipe IDs, Long Life As Long As It Does Not Get Hung Up, Which Will Twist Cables, Will Work On Curved Pipes ;