To obtain the Skate Things Safe Key needed to open the Skate Things Store Safe in Dead Island 2, travel to the northern park at Venice Beach.
There you’ll find Ollie.
Once you defeat him, loot the Skate Things Safe Key. Now that you have the key, travel to the Skate Things shop.
Inside you’ll find the Skate Things Store Safe. Unlock it to receive the Impactor Pipe Wrench.