*Forged with high grade Chrome Vanadium
  steel
*Through the process of precise CNC,
  the concentricity is formed
*72 teeth, each turn supply 11 teeth 
  contacting with gear provide more strength
  and durability
*Intrinsicaly safe push botton.
*Simple but effective switch easy to
  reverse the driver *Neat head design
  to keep the diry and contaminants out of
  the mechanism 
*Ergonomic handle design
*SIZE: 1/4"DR, 3/8"DR, 1/2"DR.