Obsidian Arms AR-15 Specialty Tool Set 4-Piece. It has also been heat treated for hardness so that it will not deform when used. A Delrin Punch for starting trigger and hammer pins as well as pushing out take down and hinge pins. Also includes a Small Drift Pin for positioning the trigger and hammer in a lower for easy installation. The newest addition to the set is our Pivot Pin Detent Tool that makes installing the pivot pin detent an easy process. Like our full punch set this also has a life time warranty if you break it we replace it. Specifications for Obsidian Arms AR-15 Specialty Tool Set: Manufacturer: Obsidian Arms Size: Not Included Color: Black Finish: QPQ Fabric/Material: 4140 Steel Gun Make: AR Platform Gun Model: AR-15 Weight: 0.15 lb Condition: New Country of Origin: USA Features of Obsidian Arms AR-15 Armorer's Specialty 4-Piece Tool Set Professional set of four punches and tools 4140 alloy steel is heat treated for the right hardness and durability QPQ finished for a rust-preventative coating Includes: 3/32in Bolt Catch Removal Punch for removing the bolt catch roll pin from the front of the receiver Delrin Punch for starting trigger and hammer pins as well as pushing out take down and hinge pins. Small Drift Pin for positioning the trigger and hammer in a lower for easy installation. Pivot Pin Detent Tool to keep control of the Pivot Pin detent during installation Package Contents: Obsidian Arms AR-15 Armorer's Specialty 4-Piece Tool Set 3/32in Bolt Catch Removal Punch Delrin Punch Small Drift Pin Pivot Pin Detent Tool What firearm models does the manufacturer say Obsidian Arms AR-15 Specialty Tool Set is compatible with? The manufacturer suggests that Obsidian Arms AR-15 Specialty Tool Set is compatible with AR-15Obsidian Arms OA-APS-15-SPL-4: AR-15 Specialty Tool Set 4-Piece