25 piece compact tool set with tools and bits from wera39s top 20 innovative tools for plumbing and heating systems the sets main advantages joker ratchet wrench with fastener holding function zyklop ratchet for fast and powerful operation torxreg hf bits with holding function for safe feeding of the screw into recesses kraftform insulated vde screwdrivers for work up to 1000 volts kraftform chiseldriver pound through screwdriver hollow shaft nut driver screwdriver for screwing in b