Fretz F-2A offers Convex Fluting Stake (AN8000-F2A)

Fretz Convex Fluting Stake F-2A - Lining
This convex fluting stake was designed by Bill Fretz for forming concave flutes. Ideally it should be used in progression with the F2B Sharp and F2C Extreme Sharp fluting stakes on after the other.

Each offers stake is of the same design but with a slightly sharper angle.

The stake is just under 3" in length

This stake can be used with

the H-1 standard stake holder
https://www.etsy.com/sg-en/listing/200590359

the H-1L extended stake holder
https://www.etsy.com/sg-en/listing/200608247

or the VH-1 vise holder for stakes
https://www.etsy.com/listing/200601202

FDJtool.com item number: AN8000-F2A