Description FEATURES:-Allow for safe release of firing pin springs-These snap caps are an excellent tool for teaching & eliminating flinching-20 Gauge-2/pack PRODUCT SPECIFICATIONS: Dimension     0.10 X 3.70 X 7.90 Height     0.1000 Width     3.7000 Length     7.9000 CALIBER/GAUGE     20 GAUGE MAGS ONLY COLOR/FINISH     RED MATERIAL     ALUMINUM NUMBER PER PACKAGE     2.0000