Here is what Bill Van Gilder has to say:
"Add interest to the bottom surface of each pot you make! Pull and wiggle this sturdy corrugated wire tool beneath each form as you cut it from the wheel head to create an assortment of subtle linear patterns. No more plain, boring base surfaces! Create great patterns across slabs and tiles. Use your wiggle wire to cut some freeform facets into your work, or cut and decorate the rims of bowls and plates. You’ll find unlimited possibilities for your wiggle wire! Helpful hint: When throwing pots intended to be wiggle-wired from the wheel head or a bat, be sure to add 1/8" to the thickness of each pot base to compensate for a deeper corrugated cut." The 16" long wiggle wire is perfect for larger pots. Comes with two sturdy hardwood handles, 3/4" dia. x 2-1/4" L.