【Hight Quality Material】Made of superior 40CR material that helps ensuring maximum durability with impact drivers,Black oxide finish that they are of strong strength and increases the life of the bolt remover.<br> 【High Power&Impact】Bolt nut remover Processed from high hardness chrome molybdenum steel, Reverse spiral flutes are designed to bite down to provide Maximum gripping power.<br> 【Diffenent Size】Fits heads size 9mm 10mm 11mm 12mm 13mm 14mm 15mm 16mm 17mm 19mm to remove damaged,Fits outside size 16mm,16mm, 17mm, 19mm, 19mm, 21mm, 22mm, 24mm, 24mm, 27mm.<br> 【Work Easy】It’s 3/8“ Drive works with all standard ratchet, impact wrenches, sockets and power tools. It can be driven with a metric spanner or socket. Bolt removers can also be used on screw heads and studs.<br> 【METRIC & SAE SIZES】Nut Remover are precision engineered to easily extract damaged bolts, nuts and screws even if they are stripped or frozen. You can depend on it quality to make every job faster, safer and a lot less frustrating!