Features: Deepening and lengthening the sleeve: chromiums vanadiums steel and hightemperature quenching. Chromes vanadiums steel with depth of over 30mm: Compared to ordinary steel, it have highhardness and is not easy to slip, deepening the sleeve and making it convenient to use. Concave hexagonals: Nut is easy to insert, have a highfit, and more firmly. Extended Hexagonals Handle Card: Slot design is suitable for wide rangings of machines, with stable clamping and no slipping. 6.35mm Hexagonals Handle Hexagonals Handle. Extended and deepened version: Multiple specifications of extended and deepened socket screwdriver head can be purchased, with specifications ranging from 5.5 to 19mm. Specifications: Material:Chromiums Vanadiums Steel Quantity:10,15 Length:Approx.150mm/5.9'' Shank: 1/4Hex Package Includes: 10/15Pcs 1/4Hex Socket note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.