Obsidian Arms AR-15 Pivot Pin Detent Tool Steel. Installing AR-15 detents can be a challenge and is often times the most frustrating part of building an AR-15. However with the Pivot Pin Detent Tool it makes the installation process much easier and less likely that the detent will slip out and get lost in your work area. Specifications for Obsidian Arms AR-15 Pivot Pin Detent Tool: Manufacturer: Obsidian Arms Size: 0.25 in Color: Black Finish: QPQ Fabric/Material: 4140 Steel Gun Make: AR Platform Gun Model: AR-15 Length: 2.75 in Weight: 0.1 lb Country of Origin: USA Features of Obsidian Arms AR-15 Armorer's Pivot Pin Detent Tool 4140 alloy steel is heat treated for the right hardness and durability QPQ finished for a rust-preventative coating Package Contents: Obsidian Arms AR-15 Armorer's Pivot Pin Detent Tool What firearm models does the manufacturer say Obsidian Arms AR-15 Pivot Pin Detent Tool is compatible with? The manufacturer says that Obsidian Arms AR-15 Pivot Pin Detent Tool is compatible with AR-15Obsidian Arms OA-PPDT: AR-15 Pivot Pin Detent Tool Steel