Press and slide button quickly adjusts lower jaw All purpose jaw grips on round, flat, square and hex shapes More groove positions provide the optimum hand location for a better grip on the work piece ProTouch™ Grips provide extra comfort and reduces hand fatigue Ratcheting action allows GrooveLock to be adjusted from the open position up to the work piece by pushing the handle up - no need to press the button Anti-pinch design prevents handles from pinching