The Fretz M-125 Large Concave Collar Mushroom Stake has dual purposes: forming compound curves at the necks of small vases and creating domes on neck collars. Compatible with Fretz H-1L and T-101 stake holders as well as the E-101 Extension Holder for a deeper reach (sold separately). All Fretz stakes are made from hardened 420 stainless steel with high polish working areas that protect your workpieces from accidental markings. Note: even though some holders are shown in the picture, all are sold separately. Made in Vietnam.