System of Measurement: Metric. Type: Combination Wrench Set. Number of Pieces: 10. MPN: Does Not Apply. The Flank Drive system grips the fastener flats and provides up to 15-20% more turning power Manufactured from special alloy steel, precision forged and heat treatment provides a superior wrench with the proper strength and durability to reduce wear and breakage 7.5° offset broaching allows the user to flip the box end over to obtain a more advantageous grip on a fastener for restricted clearance areas A continuous arc design distributes stress over the entire wrench opening radius for greater strength Sized for optimum comfort and balance in your hand Longer handles provide increased leverage and greater access to those hard to reach areas Tough, durable, nickel-chrome plating produces a mirror-like finish that helps protect against corrosion and makes it easy to wipe the wrenches clean. This wrench set is previously owned and inspected fully. See images for details.