Tiger Rock A1 Stock Buttpad Screw w/ See-Through Hole Black. It's standard length and has a 0.125" wide vent hole. Specifications for Tiger Rock A1 Stock Buttpad Screw with See-Through Hole: Manufacturer: Tiger Rock Color: Black Gun Type: Rifle Gun Model: AR-15 Fabric/Material: Metal Finish: Matte Quantity: 1 Features of Tiger Rock A1 Stock Buttpad Screw with See-Through Hole: Mil-Spec; Length: 0.625"; .0125" wide vent hole; Fits: A1 fixed position buffer tubes Package Contents: Tiger Rock A1 Stock Buttpad Screw with See-Through Hole What firearm models does the manufacturer say Tiger Rock A1 Stock Buttpad Screw with See-Through Hole is compatible with? The manufacturer says that Tiger Rock A1 Stock Buttpad Screw with See-Through Hole is compatible with AR-15Tiger Rock A1SCREW: A1 Stock Buttpad Screw w/ See-Through Hole Black