Hardened steel.
Xs Power Battery 587, Kit Zinc Steel 6Mm To 3/8 Stud Adaptor Zinc Plated (Pair)
XS Power Batteries Battery Charger XS Power High-Frequency 16 V 15 amps Each
XS Power XP2000 2000 Watt Power Cell Car Audio Battery Power Stereo System
XS Power D3100 5000 Amp Power Cell Car Battery + Hardware + Power/Ground Wires
