Bernstein interchangeable screwdriver sets with esd handle bernstein 4 960 this handy set of double ended interchangeable screwdrivers from bernstein is equipped with an esd handle with a brass clamping sleeve suitable for 4mm hexagon blades this set includes 10 mixed blades supplied in a practical tool roll which is made from conductive material bernstein 4 960 interchangeable screwdriver set with esd handle 11 piece