Mixed sets handle system 4 softfinish telescopic esd handle esd safe dissipative surface resistance 106 109 ohms enables adjustable bit holder blade length standards din 3126 iso 1173 style c 4 iec 61340 5 1 case no danger to electronic components with use of esd safe materials tough space saving metal box application bit set suitable for smallest screws with electronic components flexible working via adjustable blade length and rapid replacement of bit inserts