Starrett BM1418 Bi-Metal Unique Porta-Band Blade, 44-7/8-Inch by 1/2-Inch by 0.020-Inch, 3 Pack 44-7/8-Inch by 1/2-Inch by .020-Inch 14/18 Variable TPI 3 Blades per sleeve Bi-Metal Unique increases the weld area for faster cuts and increased blade life Multi-Edge performance of the cutting stroke produces dual chips that are more easily removed from the cut