73398500 Simonds Round Bastard File,American,8" Please log in to see price or purchase this item Quantity discounts available QuantityPrice SKU: SIM73398500 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.