Tinned Copper Battery Lugs.

The various sizes are:

16mm² - 6 B&S with 8mm bolt hole.
35mm² - 2 B&S with 10mm bolt hole.
70mm² - 0 B&S with 12mm bolt hole.
120mm² - 4/0 B&S with 14mm bolt hole.

Complete your job with a professional finish with crimpers to neatly and securely crimp fitting onto your wire, also available are automatic wire strippers. Have a look under 'Hand Tools'