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Dual Function Spanner wrench tool, made of Steel for strength & durability. Comes with a rubber coated handle that provides a comfort grip & non-slip easy torque handle. It is used to assist in easily removing your old extension tube and installing a newer style A4 Stock. It also features a cutout to fit the receiver extension tube to remove the A1 or A2 stock. A Great tool for any Rifle Enthusiast or Gunsmith looking to work on an AR-15/M4 style rifle.