Knivesusa is proud to feature one of the best-selling and fastest growing classes of knives found today - assisted openers.  Assisted opening knives utilize a system that assists the user to smoothly open the knife with a manual push on the blade's thumb stud or pull back on the blade protrusion.  While each knives manufacturer utlizes slightly different technology to accomplish this, most knives feature a torsion bar.  In the closed postion, the torsion bar helps keep the knife closed, preventing it from being opened by "gravity." In order to open the knife, the user must apply manual pressure to the thumb stud or blade protrusion to overcome the resistance of the torsion bar. After the blade is out of the handle, the torsion bar moves along its half-moon track and takes over. The blade opens smoothly and locks into position, ready for use.  See our entire selection of assisted openers listed below or narrow your choice down by brand using the dropdown box above.