IRWIN Tools VISE-GRIP Extension Chain for 20R Locking Chain Clamp, 18-inch (40EXT) None Imported Vise parts fit your existing 20R IRWIN VISE-GRIP locking tools Vise parts replace damaged or worn-out parts Choose the appropriate size for your existing tool Vise parts fit your existing 20R IRWIN VISE-GRIP locking tools Vise parts replace damaged or worn-out parts Choose the appropriate size for your existing tool