The Snap On C-67 Allen Wrench Set of 6 is a high-quality tool set designed for automotive use. Made by the reputable brand Snap-on, this set includes six pieces in various sizes such as 9/16, 1/2, 5/8, 7/16, and two 3/8 inches. 5/16 is unmarked and not a snap on making a set of 7 The wrenches feature a 6 point drive type, all have clean sharp angles and edges.