(4) Tray Arrow Locking Tab Latches with Retainer Rings for Crane National snack vending machines including models 147, 148, 157, 158,159,160, 167, 168, 170, 171, 172, 173, 797 and other machines. The arrow latch tabs tend to break over time. These are a must have if your machine is showing an error on display stating "A, B, C, D, E, F, H unlatched". The arrow latch tabs keep the tray against tray cabinet board connection. The arrow latch tabs are brand new.