Pocket size punch is constructed of hardened steel, the tool will hold and install standard 1-1/4-Inch (31.2 mm) trim nails. Small size allows easy access to recesses of formed trim pieces. Hex collar prevents rolling when tool is set down. Corrosion resistant. Mini Size Trim Nail Punch is pocket size and constructed of hardened steel, the tool will hold and install standard 1-1/4-inch (31.2 mm) trim nails. Small size allows easy access to recesses of formed trim pieces. Hex collar prevents rolling when tool is set down. Corrosion resistant.