Gearwrench® 8Pc Metric Hex Insert Bit Set Suits 6 & 12 Point Wrenches Speciality Pumps & use included stainless steel Once paired & use included stainless steel springs or Inconel wire on anchor hooks Weighted body Jig & Octopus hooked skirt The 8 piece metric hex insert bit set comes with a tray for storage and includes sizes 3mm 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