4mm insulated screw in adapters with an external screw connection, in various sizes, for insertion into the relevantly sized threaded hole.These 4mm screw in adapters feature a rigid socket in an insulator accepting spring loaded 4mm diameter plugs with a rigid insulator sleeve, the socket has a internal slot to accept a 4mm wide flat blade screw driver to aid assembly.
1000V CAT II
Rated at 32A