【KEY SET】Set of 9 long-arm Allen keys for quickly tightening or loosening fasteners. Metric sizes. The Allen key is made of chrome-vanadium steel with high torque hardness. Polished surface with double chrome-nickel coating, also rustproof. 【9 PIECES OF HOLLOW TORX INCH KEYS】- Sizes include T10 (1.5mm), T15 (2mm), T20 (2.5mm), T25 (3mm), T27 (4mm), T30 (5mm), T40 (6mm), T45 (8mm) and T50 (10mm). For professionals (workshops, garages) as well as for laymen for assembly work at home. 【EXTRA LONG ARM】Long Allen keys save time in hard-to-reach and blind places. Different dimensions meet your different needs. And the hollow bottom design supports special Torx screws with concave tips on the bottom, such as removing or installing most Allen screws for cars, furniture and appliances. 【SUSTAINABLE】- Made of durable chrome vanadium steel for rugged strength and a corrosion-resistant satin finish. With CRV material, hardness up to 56 degrees and overall heat treatment are durable and strong.