A professional set of YATO Allen keys with a Torx Security tip The set is packed in a practical and handy plastic pendant that makes it easier to search for the right key size The keys have a special tip with a hole adapted to cooperation with Torx Security or Tamper Proof screws Keys made of high quality CRV 6150 vanadium steel, characterized by strength and elasticity Allen sowing hardness 52-55 HRC T 10 T 15 T 20 T 25 T 27 T 30 T 40 T 45 T 50