These latch kits fit specifically into Gunnebo UKN Weld-on Excavator Hooks. Even more so than other latch kits, these latch kits are an integral part of the UKN hook. They are made of alloy steel and can take a lot of abuse, and help to make sure that the connection remains while the bucket is in motion. That said, you should not load the latch directly, nor should you load the tip of the hook. Please refer to the instructions supplied with each UKN hook for proper welding procedures and lifting technique.