Features. Box ends incorporate a radius corner design that engages the flats of the fastener not the corners providing up to 15 -20 more torque while reducing fastener rounding enhancing the turning of worn fasteners. Box ends are offset a true 15 for clearing obstructions and knuckle clearance on flat surfaces. The shank to box end transition area is also reinforced to provide greater strength. Open end has a radius design for greater strength; especially when compared to a hex open end. Large size stamp on both ends of the wrench and both sides of the wrench for ease in identification. Black oxide finish provides smooth edges with an industrial finish. Manufactured from high alloy steel using the most up-to-date manufacturing process and heat treat for greater strength and durability. Meets or exceeds asme b107.9m-1994. 12 point metric black oxide long combination wrench set. 15 pieces

• Box ends incorporate a radius corner design that engages the flats of the fastener, not the corners,
• Box ends are offset a true 15° for clearing obstructions and knuckle clearance on flat surfaces
• The shank to box end transition area is also reinforced to provide greater strength
• Open end has a radius design for greater strength; especially when compared to a hex open end
• Large size stamp on both ends of the wrench and both sides of the wrench for ease in identification

Box ends incorporate a radius corner design that engages the flats of the fastener, not the corners,Armstrong Tools