• Used in conjunction with a standard air hammer at low pressure and 5/16”(8mm) hex bit.• Vibration shakes the screw loose doing the hard work for you, while rotation is applied with the handle.• Ideal for corroded, countersunk, overtightened and painted screws.• No more stripping of screw heads.Used in conjunction with a standard air hammer at low pressure and 5/16”(8mm) Hex bit. Vibration shakes the screw loose doing the hard work for you, while rotation is applied with the handle. Ideal for corroded, countersunk, overtightened and painted screws. No more stripping of screw heads.• Used in conjunction with a standard air hammer at low pressure and 5/16”(8mm) Hex bit. • Vibration shakes the screw loose doing the hard work for you, while rotation is applied with the handle. • Ideal for corroded, countersunk, overtightened and painted screws. • No more stripping of screw heads. • Model No. VS0291Technical Specification:Nett Weight: 0.20kgShank Size: .401" Parker TaperBit Size: 5/16"(8mm