What is "retouchers"

Usage examples of "retouchers".

Droog grunted, then he shook out the leather that was spread across his lap to remove the small chips and splinters of stone, placed the mammoth-foot anvil, hammerstone, bone hammer, and the bone and stone retouchers in the middle of it, and wrapped them up and tied them securely with a cord.

Various stone and bone hammers and retouchers were in evidence on the extension of the bed platform at the foot.