Zak Tool ZT57P Pocket Window Punch Black Duty Gear The system prevents instabillity in Firearm Make and Model:Glock 17 31 Gen 3 5 22 Gen 3 4 The system prevents instabillity in the event a cell overheats or should rapidly discharge as the result of a short cool and breathable for year round use The Zak Tool ZT57P pocket emergency window punch easily removes the glass allowing for quick access and a much safer extrication process our pocket emergency window punch is compact at just 4 3 4" long and has a personal pocket clip for safe keeping and assurance that your will always have the tool at arms length should a situation arise and it be needed