Geissele's Gas Block Pin Set allows users to easily install or remove gas blocks on AR15/AR10 platforms. This tool set works particularly well when dealing with gas tube roll pins that are old, stuck, or rusted. Both punches are machined from properly hardened and tempered 01 Tool Steel, but like all pin punches, the Geissele Pin Punch Set is considered a consumable item that will eventually wear out and need replacement. Geissele Gas Block Pin Punch Set 15-172