The Wheeler Engineering Roll Pin Punch set is machined from hardened steel to prevent bending or breaking whileinstalling any 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, and 1/16 punches in a durable nylon sheath.