Machined from hardened steel to prevent bending or breaking while driving any size roll pin. The punches are designed with a hemispherical tip to provide proper alignment of the roll pin to prevent damage to the firearm and the roll pin. The 9 piece set includes: 5/16, 1/4, 7/32, 3/16, 5/32, 1/8, 3/32, 5/64, 1/16 inch punches in a fitted nylon storage pouch.Specifications and Features: Battenfeld Technologies 710910 661120109105