Real Avid Professional Grade AR15 Armorer's Master Wrench. This Armorer's Wrenches brought to you by Real Avid isn't just a wrench; it's the only tool in its class to include a customizable armorer's hammer as well. The Real Avid Armorer's AR15 Master Wrench holds its shape under pressure and provides you with the proper torque to take on even the most stubborn castle nuts without causing any damage to the nuts or your firearm. With deep set sockets this tool firmly grips the nuts without slipping. Make critical adjustments anywhere you need to with the extremely versatile Real Avid Armorer's Professional Grade Master Wrench. Specifications for Real Avid Armorer's Master Wrench: Manufacturer: Real Avid Fabric/Material: Rubber Brass Steel Nylon Color: Black Gun Model: AR-15 Length: 10.75 in Width: 7.85 in Features of Real Avid Armorer's Master Wrench: Hardened stainless steel 3 interchangeable hammer heads (Nylon Rubber Brass) Ergonomic grip Package Contents: Real Avid Armorer's Master Wrench Castle Nut Wrench 0.5in Torque Receiver Fixed Steel Hammer Head Brass Hammer Head Nylon Hammer Head Rubber Hammer Head Torque Specs Laser Etched Behind Hammer Heads 0.625in Wrench for Fixed Stock Receiver Extensions 0.75in Muzzle Brake Wrench Free-float Barrel Nut Wrench Mil Spec Barrel Nut Wrench Interchangeable Hammer Head Receiver What firearm models does the manufacturer say Real Avid Armorer's Master Wrench is compatible with? The manufacturer suggests that Real Avid Armorer's Master Wrench is compatible with AR-15Real Avid AVAR15AMW: Professional Grade AR15 Armorer's Master Wrench