Use the F-9 Convex/Concave Stake to make a range of synclastic and anticlastic forms from shallow concave curves to S-shaped sculptures. One side is convex and allows you to make a shallow dome. The other side is for making concave bracelet sized jewelry.  .Fretz stakes are made from hardened 420-grade stainless steel with highly polished areas to prevent scratching or marring your workpiece. Designed for use with Fretz H-1 or VH-1 holders (holders may be shown in the picture but are sold separately). Made in Vietnam.