Description Secure latch-style couplers with this adjustable, keyed lock. Six locking positions adjust to fit?coupler latch widths up to 2-1/2". Keyway cover protects cylinder from dirt and moisture. 1/4"-diameter pin.Adjustable, six-position locking coupler latch fits widths to 2-1/2"Keyway cover protects cylinder from dirt and moisture1/4"-diameter pin