✅ Heat treated tool steel 6150 - Rockwell hardness 50-52 ✅ Aerospace grade #2024 Aluminum piston ✅ Compatible With N5010A 1/2" Standard Crown Stapler ✅ N5010ABM 15.5 Gauge 1/2 Inch Crown Flooring Stapler ✅ N5010AM 2 Inch 16 Gauge Medium 1/2 Inch Crown Stapler