Add some style and enhanced ergonomics with the MDT Bolt Knob. Designed to give you better control over your existing bolt, the textured soft polymer sleeve and subtle hourglass shape cradles your finger so it can be easily maneuvered without slipping. The MDT Clamp-on Bolt Knob can be easily installed over your existing bolt knob, so there's no need for gunsmithing or modification. Specifically designed clamshells are made for each of our supported inlets and uses friction pads and 3 screws to keep the bolt knob tight and secure. Installs over existing Bolt Knob - ANTI-SLIP FOAM FRICTION PADS FOR A TIGHT FIT - SOFT POLYMER SLEEVE THAT LOCKS IN PLACE