The Wheeler Engineering� Roll Pin Punches are 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 punches in a nylon pouch. - 9-piece set 1/16 through 5/16 - Hardened Steel construction - Hemispherical Tip - Fitted Nylon Storage Pouch