Jonard's pump pliers are made of ultra strong tool steel and are heat treated for maximum strength and durability. These pump pliers feature the following: Secure tongue and groove design to provide a slip-resistant grip and ability to withstand heavy pressure Six tongue and jaw positions with smooth, positive interlock between halves for comfort and versatility Maximum jaw opening of 1 3/4" (44 mm) for a broad range of applications Ergonomically designed handle with dipped plastic grip for greater comfort and torque