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 Groove Lock 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. Jaw capacity: 2-1/4"; groove positions: 16; pipe size: 1-1/2".