73393000 Simonds Round Bastard File,American,4" Please log in to see price or purchase this item Quantity discounts available QuantityPrice SKU: SIM73393000 Qty On Cart Features Often referred to as Rat Tail Files, bastard cut round files are intended for enlarging and rounding out circular openings or concave surfaces with a ... Features Back FeaturesOften referred to as Rat Tail Files, bastard cut round files are intended for enlarging and rounding out circular openings or concave surfaces with a coarse cut.