This F-7 Thin Shell Stake is narrower than the F-6 so is perfect for forming small convex and concave curves to yield small-scale anticlastic shapes. 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 (shown in image, but sold separately) or VH-1 holders (sold separately). Made in Vietnam.