Anschutz Design Bolt Knob
Replacement bolt knob made of machined aluminum.
Anodized a beautiful deep blue or deep red color and wrapped with three thick rubber rings.
The effect of those rings is that you can flip the bolt open with the back of a finger, or your thumb, or any part of your hand. That means faster, easier ejection of the shell and loading. If you're shooting gallery matches that means you spend your one minute per shot more wisely; if you are shooting outdoors it means you can get more shots off while in your primary wind condition.
Simply unscrew the standard bolt knob that came with your rifle and screw the new one on. Removing the old one often takes a pair of pliers and some effort. A dab of Loc-tite on the new bolt knob will keep it in place as well.