The depressed areas between the lands (raised surfaces) in the bore; the cutaway portion of the rifling into which the jacket or rotating band of a bullet fits to impart rotation to the bulletin its line of flight
Guide channels cut into the ice at the starting area, allowing a sled to follow a straight line during the process of pushing and loading
Depressions in the periphery of a sheave or drum for positioning and supporting a rope Peening - Permanent distortion of outside wire in a rope caused by pounding