Hollow Punch Set for Drills and Drill Presses, Pack of 6 6 different sizes let you punch just the right hole size for nearly any project; Comes with Free How to Live Stress Free Ebook Cut precision holes in leather or heavy fabric Punches holes in leather, rubber, canvas, cardboard, plastic and other soft materials Hex shanks for secure, non-slip fit in any chuck Drill bit sizes are: 3/16 inches, 1/4 inches, 5/16 inches, 3/8 inches, 7/16 inches, and 1/2 inches