Answer: knurling

AnswerCrossword Clue
knurlingseries of knurls, as on a knob
knurlingto make knurls or ridges on
knurlingconvex molding having a series of members separated by indentations, as a bead and reel
knurlingsmall ridge or bead, esp. one of a series, as on a button for decoration or on the edge of a thumbscrew to assist in obtaining a firm grip
knurlinga moulding of ornamental knobs
knurlingknur