About this item 【TOP MATERIALS】: Made of Chrome Molybdenum Steel, the top material in pneumatic tool applications, the material cost is three times that of Chromium-Vanadium Steel. 【PRODUCT PROCESS】: Deeply hardened, it has the best impact resistance, high strength and toughness, and the overall performance is top. And the corrosion-resistant: manganese phosphate coating & sandblasted finish. 【SPECIFICATION】: 9-Piece 6-Point Metric: 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 38mm. Extra-deep 3. 15 inch. Specification size laser marking, clear and easy to distinguish. 【USING RANGE】: Suitable for all kinds of large equipment maintenance and assembly, car repair, home repair, et. 【STORAGE CASE】: All 1/2" driver impact socket set are contained in plastic toolboxes, for easy storage and use. Brand: SUNHZ MCKP Item Length: 3. 15 Inches Material: Chrome Molybdenum Steel Finish Type: Corrosion-resistant,Manganese Phosphate Coating,Sandblasted Finish Number of Pieces: 9