Irwin Quick-Grip 12 x 3-1/4 in. Medium Duty One Hand Bar Clamp features a quick change spring-loaded screw and a heat-treated black oxide carbon steel I-beam bar for durability and strength. It includes removable resin pads and a patented locking swivel jaw that conforms to uneven work surfaces, ensuring a secure grip. The quick release trigger allows for easy one-handed use, delivering up to 300 pounds of sustained clamping force. This clamp is designed for convenience and reliability with a maximum jaw capacity of 12 inches and a throat depth of 3-1/4 inches, making it an essential tool for various clamping needs. Model Number: 1964718