To provide with ridges, to assist the grasp, as in the edge of a flat knob, or coin; to mill.
The roughened pattern on the barbell's surface that makes gripping it easier and more secure.
A patterned or grooved area on the barrel of the dart, for better gripping
Indented or crimped portion of the skirt at top of cap used for holding liner in cap, used as a grip for applying cap and also for a better hold or grip for removing.
1] A series of small ridges on nuts and knobs to provide a grip for fingers.  To indent or roughen the finished surface of a piece of metal by pressing a series of cross-hatched lines into the surface and thereby raising the area between these lines.
A pattern of riges on the surface to provide grip.
The indented or crimped portion on the skirt at the top of the cap used for holding the liner in the cap. The knurl is also used as a grip for removing the cap. The knurl provides a non-skid surface during the threading operation.
A small projecting ridge to assist in gripping an object.
Grooved or patterned surface on the barrel of the dart, preferred by some for gripping purposes
Done to roughen a surface or to increase a diameter, straight lines or diagonal cross-hatch indentations are made in a metal surface, which forces the areas between the indentations outward in a radial manner from the axis of the knurled part, which enlarges the surface area.
A series of ridges formed on the outer surface of a piston or the inner surface of a valve guide to help reduce clearance and hold oil for added lubrication.