Profile bit Detail Carving Liner 1/4" Shanks 2 1/2” length USA Veteran Owned Foos 2 sided, Solid router bit . The Foos 2 sides router bits are designed to easily interchange router bit cutting edges. This Bit is a 15° Profile & 20° Detail Carving liner. This bit is designed for the pro wood-carver & many other uses. The 2 1/2” Offers full length in order to flip the router bits and fit properly into the collet.