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Twin-Rail M4 Stud Bus Bar Block
A 130 x 56 mm insulated power bus for 12 V rigs and bench supplies. It has two rails of five M4 studs each, spaced 20 mm apart. The bolt heads (7 mm across flats) are held in hex pockets underneath, and each rail has a 13 mm-wide, 1.6 mm-deep channel for a copper or brass strip you cut and drill yourself. A 12 mm divider keeps + and − ring terminals apart, and two M4 / #8 screw holes mount it to a panel or wall.
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