Canopus Red Lock tension rod locks are just another example of how the engineers at Canopus are making life easy for the gigging drummer. Drums go out of tune mostly around the area your stick stikes. When your hoop sinks from a rimshot, thats when the rods start to move. Red-Lock helps ensure that even the hardest rimshots won't loosen tension bolts. Spend less time tuning, and more time playing!