Sks hirschmann 4mm buela 300k bunch plugs 30a sks hirschmann 931667102 blue multiple spring 4mm wire bunch plug from sks hirschmanns buela 300 k series shatterproof and with a flexible insulated sleeve with transverse hole lateral supports provide protection against contact when plugged in at right angles the tapering sleeve end also serves as kinking protection for the lead sks hirschmann 931667102 4mm buela 300 k bunch plug 30a blue