【Premium Material】DISEN Allen Key Sets are made of high quality heat treated CR-V 6150 of HRC 53-60 with great hardness and durability, and finished with black oxide | 【Multiple Size Selection】DISEN 25 Pieces Allen Key Sets include SAE, Metric and Torx Star Sizes. SAE: 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4. Metric: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm. Torx Star: T9, T10, T15, T20, T25, T27, T30, T40 | 【Compact Design】Each allen key can be folded into a small handle made of soft rubber and ABS material with a keyhook, easy to carry and can be put into pockets or tool bags. Each key is stamped with specific size so that you can always pick the right size to use | 【Useful Tools】DISEN Allen Wrench Key Sets are useful tools and small enough to go into the tight space where traditional hex key can not reach. You can use them to easily tighten or loosen the bolt and nut, suitable for auto repair, DIY project, and household appliance maintenance | 【Quality Guarantee】We assure you that every allen key has been tested strictly to meet the industrial standard of hardness and durability. They can last for a lifetime with normal use