About this item FLEX-HEAD DESIGN:180 degree rotating flexible heads of ratcheting wrench set allow you to apply leverage at any desired angle and get around obstructions;72 teeth ratchet gear needs a minimum of 5 degree swing arc that is perfect for restricted, hard to reach work spaces. MULTIPLE STANDARD SIZE: Metric and standard wrench sets have multiple size including 8mm,9mm,10mm,11mm,12mm,13mm,14mm,15mm,16mm,17mm,18mm,19mm to ensure that you have the right tool to tackle any screw or bolt and meet your different requirement . .