Helps you achieve the exact bevel angle on any fingernail or long grind gouge when used in conjunction with the fingernail profiling arm.
Additional to the original angles this design has also 60°. To use this the ProEdge Long Grind Jig is needed (See Robert Sorby Homepage).
Design is based on the original Angle set. See https://www.robert-sorby.co.uk/sharpening/proedge/wproset-proedge-angle-set.
The author hasn't provided the model origin yet.