• Includes 15–25 and 27 mm sockets in a storage tray • Flank Drive® wrenching system delivers up to 20% more turning power without slipping or rounding while exceeding ANSI® performance standards • The hex depth of our impact sockets will start to thread the nut onto the stud; competitive sockets with a deeper hex require the user to start the nut by hand • Snap-on® impact sockets are heat treated to optimize impact service life with a lower hardness than hand sockets and are able to withstand repeated cycling loads of impact wrenches • Manufactured from the highest quality domestic steel, providing optimum strength, durability, and longer life • Square drive side hole works with ball- or pin-type retention • Industrial finish helps protect against corrosion