Irwin Quick-Grip Bar Clamp/Spreader, 6". Heavy Duty, Next Gen. QUICK-GRIP Heavy-Duty One-Handed Bar Clamps Features: The IRWIN QUICK-GRIP Heavy-Duty One Handed Bar Clamp evenly distributes up to 600lbs of sustained clamping pressure is one of the top performance One-Handed Bar clamps available. Ideal for heavy-duty applications such as installation, demolition and rough glue-up. Dual removable swivel jaws and non-marring, full-faced pads for even distribution of clamping force. Pads can be removed for full contact of the swivel jaws to combat flexing at extreme pressure and to conform to irregular shapes New grip design and Quick-Release trigger provide simple, one-handed operation.