The Geissele Gas Block Pin Punch set are made specifically for the removal and installation of the 0.078" roll pin that secures the gas tube to the gas block on an AR-15/AR-10. Removal of a rusted in gas block roll pin has always been a challenge since there are no commercial pin punches in 0.078" diameter. 1/16" (0.062") punches have a tendency to bend and very few starter punches are available in 1/16" diameter. The Geissele punch set make gas block work a whole lot easier.FeaturesMade of hardened and tempered 01 tool steelLong taper to prevent bendingIncludes starter punch and pin punch