Gearwrench® 8Pc Metric Hex Insert Bit Set Suits 6 & 12 Point Wrenches Speciality Pumps & use included stainless steel External & use included stainless steel springs or Inconel wire on anchor hooks Selectable "impuls" mode for removal of stubborn screws and for spot drilling on smooth surfaces or 15mm 6 and 12 point box end static or ratcheting wrenches Ratcheting wrench insert bits are designed to give access to fasteners in really tight spacesCan be inserted into the box end of a wrench and act like a low profile bit socketFits in 8mm 12mm or 15mm 6 or 12 point wrenches or ratcheting wrenchesNarrower profile when used in a ratcheting wrench than standard ratchetsZinc phosphate coating for corrosion resistanceBall detent securely holds the insert bit in the wrench