knurled

Having small ridges or crosshatching cut or milled into the surface, to aid in gripping.

knurlingexamples

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At the end of the hallway was a laboratory; a long, scrupulously clean worktable held a number of stations, each consisting of a microscope and an articulated brass framework of some sort, equipped with three mutually perpendicular knurled wheels for performing fine adjustments.

Definition from The American HeritageĀ® Dictionary of the English Language, 4th Edition (via Wordnik); images from WikipediaĀ and Amazon

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