Abstract: An apparatus is disclosed for inspecting the cutting features of twist drills to determine the concentricity of the drill's chisel ridge and the symmetrical status of the outer corners of the drill's flutes. The apparatus comprises an upstanding V-shaped block defining first and second legs having flat inner surfaces positioned at a right angle to one another, the legs having flat upper and lower surfaces which parallel one another and which are at a right angle to the inner surfaces of the block. The second leg is wide enough to stably support a reference plate slidably mounted in a channel formed in the leg. The reference plate has a longitudinally extending slot therein, and threaded means connected to the channel to releasably fix the reference plate in the channel. The forward end of the reference plate terminates in an edge which parallels the inner surface of the second leg, and is preferably beveled downwardly to provide a reference line at the undersurface of the plate.