Proto J1221MASD Satin Finish Metric 21mm Combination Wrench, 12 Point

Proto J1221MASD Features

• Satin finish provides corrosion resistance and a slip resistant grip
• 12 point box end allows for fine indexing, helping to improve speed and access. Fits 4, 6 and 12 point fasteners
• Anti-Slip Design (ASD) Open End
  -Patented locking grooves help prevent the wrench from slipping off the fastener when turning
  -The arched surfaces are designed to spread the contact forces over a greater area
  -Loads are kept off the corners of the fastener which helps prevent fastener rounding
• Metric sizes 9mm and smaller and sizes 36mm and larger do not have the ASD feature
• Box ends incorporate the TorquePlus™ system
• Proto® TorquePlus™ wrenches are ideal for use on stubborn or damaged fasteners, and also on fasteners made from soft materials
• The TorquePlus™ design is a high performance drive configuration which allows for quick and easy wrench engagement to the fastener flats, not the corners
• The TorquePlus™ configuration employs a radius-corner design, shifting contact area and stress away from the fastener corners and distributing contact stresses over a large area of the box end, minimizing slippage
• The TorquePlus™ internal design minimizes fastener rounding, helps to extend fastener life, and allows the user to more easily turn worn, rounded, or rusted fasteners