Jumper Grounding Strap with Single Flexible Braid 330 AMP - 12in. Flexible braid jumper grounding straps are recommended for motion due to expansion, contraction, vibration and operational movement of current carrying members. Manufactured from flat, extra-flexible tinned braid, they are available in a wide variety of sizes and amperages. The ferrules are made from pure electrolytic copper and are tin-plated. Standard mounting holes are 9/16" NEMA spaded holes.