6308 - Double Ring Wrench Set 6 to 22MM

8 Piece Set of Metric Double Ring SpannersSizes 6x7mm, 8x9mm, 10x11mm,12x13mm, 14x15mm,16x17mm, 18x19mm, 20x22mmDifferent bi-hexagonal openings at each endMade of Chrome VanadiumSatin Finish for increased grip in oily environments 75 degree offset headSupplied in a color boxManufactured and designed in accordance with DIN3113A in high grade chrome vanadium steel.The ring head is offset 15 degrees to facilitate use even on flat surfaces.All ring heads are equipped with Teng Tools "hip grip" system, which means the contact surface grips on the flat surfaces of the nut or bolt head rather than on the corner. This system helps to prevent damage to nuts and bolts and makes it possible to grip nuts and bolts which already have damaged corners.A Typically Teng new design in combination spanners that gives an anti slip grip on the open end as well as the Teng hip grip function where the spanner drives on the flank of the fastening rather than on the corner.Two design features that combine to give a much better grip with much less risk of damage to the fastening.The design also gives grip on fastenings with worn or rounded corners.