Brand GEARWRENCH Material Chrome Molybdenum Steel Drive System Nutsetter Finish Type Black Oxide Number of Pieces 44 About this item Chrome molybdenum alloy steel (Cr-Mo) for exceptional strength and durability Off-corner loading design reduces fastener rounding Black oxide finish to resist corrosion Included Components: ‎Standard /Deep SAE: 5/16″, 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″, Blow molded case, Extension: 3″ & 6″, Standard Metric: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19mm, Universal Joint, Deep Metric: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21mm