The Tru-Fire Rivet offers phenomenal accuracy and ease of use at an affordable price. The linkage style design allows you to simply push the thumb barrel forward to close the full capture hook around your "D" loop. The machined aluminum handle provides a lightweight yet substantial feel in your hand. The machined internal components feature a Nickle Boron coating on wear surfaces to reduce friction and increase life. The Rivet comes in the package as a 3-finger release but can be easily changed to a 4-finger option with the included 4th-finger attachment. This attachment can also be adjusted to sweep the 4th finger back if desired.. All of this plus adjustable trigger travel and a multiple-position thumb barrel gives you a custom fit and feel.FEATURES: Link Style 3 or 4 finger handheld release Flat anodized Gray One hand operation - push thumb barrel forward to close Full loop capture Tension adjustable 1.75oz to 50oz Machined from aerospace aluminum Adjustable thumb post Compatible with Wrist Assist