STRONG HAND POWERBASE GROUNDING MAGNET - 300A - GM203 The PowerBase Grounding Magnet sets up quickly and easily. Start grounding instantly! Powerful rare earth magnet delivers heavy duty holding power. The V machined surface grips round parts. The copper connector stud is located on top and allows for a full 360 cable rotation. Rugged, compact steel housing for a fast and safe ground, even in tight spots!