A Liner (Graver for Shading)

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Making a Curved Hinge
Freshening a Rifle Barrel
Proportioning Dividers
Depth Gauge
Inside_out Calipers
Liner (a special graver)
Shop Made Chisels
Tools for Carving Class
A liner is a graver that cuts several lines at one pass. They were used for "shading" which adds the impression of depth to a design. Some of the imported trade locks show the use of liners in the engraving but use by American gunsmith generally dates very late in the 18th century.

The grand rifle by John Sheets illustrated in Volume V of JHAT has liner decoration around some of the screw heads.

Bottom of liner with seven teeth:

End view of cutting surface (coated with black marker to hide the glare):

A few quick cuts: