Narex 8 mm 5/16" Round Cabinetmaker Wood Rat Tail Fine Cut Rasp 872562 Made by a highly respected tool manufacturer in the Czech Republic and is of exceptional quality Blade is 8 mm (5/16") in diameter and 200 mm (8") long. Overall length is 345 mm (14") Fine cut pattern with 22 tenth per square centimeter The blade is made from tool steel and then hardened to RC 45 Blades are CNC stitched which produces a uniform tooth pattern for even stock removal