The Klein Tools D502-12 is a 12-inch pump plier — Klein’s name for their straight-jaw tongue and groove design. The standout feature is the Quick-Adjust Rivet, which lets the user cycle through all six jaw positions with one hand by pressing the top handle; no second hand needed to pull the jaws apart and reset. Maximum parallel jaw opening is 2-3/8 inches (6 cm), across six machined tongue and groove positions. Jaws are induction-hardened with robust teeth.
One-hand adjustment is the reason to reach for this plier over a traditional Channellock — plumbers under a sink or electricians working behind a panel often have only one hand free, and pressing the button to reposition the jaws is faster than re-gripping with both hands. The tongue-and-groove design with its stack of six machined positions handles everything from a small compression nut to a 2-inch drain slip nut. Induction-hardened teeth bite hard without rounding over, and the 12-inch handle length gives plumbers the leverage they need for large slip nuts and corroded fittings.
A daily plier for plumbers, maintenance techs, and service electricians who want a one-handed adjustable in the pouch. Klein’s answer to the Channellock 440.
Per the Amazon listing, the D502-12 is Forged in the USA using U.S. steel. Klein Tools has been a family-owned American hand-tool manufacturer since 1857.
