Irwin 27 Vise-Grip Locking Chain Clamp Pliers (20R) Chain holds and locks around any shape or size. Ideal for awkward shape pieces. Constructed of high-grade heat-treated alloy steel for strength and durability. Turn screw to adjust pressure and fit work and remains in adjusted position for repetitive use. Classic trigger release provides maximum locking force. Jaw Capacity: 18" (455mm), Size: 9" (255mm)