1/2" Diameter 1/16" Wide Keyseat Cutter Straight Tooth, American Standard # 204, High Speed Steel 2-1/16" Overall Length 1/2" Shank diameter, 2" Long Shank 1/2" Diameter +.015"/+.020" 10 Teeth 1/2" Diameter 1/16" Wide HSS Keyseat Cutter Straight Tooth, American Standard # 204, High Speed Steel, Made in the USA, Super Tool 40532