This is a 3 pack of extra rectangle punches for the Whaley Sliding Hammer. Measurements : 1.5 by 5mm, 2 by 5mm, and 3 by 5mm Need to move metal in a very careful and precise way? Now it’s easier with the NEW Whaley Sliding Hammer. This revolutionary tool has a slender, hollow hammer head which holds a long punch that slides back and forth within the hammer head. Great for stone setting, channel setting, riveting, repousse, texturing, chasing and more. Patent Pending.