This easy to use tool has been specifically designed to allow the KORO rodent spring trap to be easily set. To use, the hook at the end of the tool is placed under the strike bar and is then pulled up until the tool locks onto the frame of the trap. Once in this position, the safety catch can be placed over the strike bar and the tool slowly released. The strike bar will now be held by the safety catch and the trap is ready to be set. Please note that this tool is not suitable for the KORO Large Rodent Spring Trap.