Tenonizer Technology LLC builds the safest, best and most accurate tenon cutters made. All of the tenon cutters cut with the grain, not against it.Even with the smallest tenon cutter you can maintain an accuracy of + or - .005" That is close. Each tenon cutter will adjust in seconds to cut any tenon dia. from 1 3/8" dia. to 4 5/8" dia. Depending on the model, with cutting time of 1 to 3 tenons per minute.