"said tool" or "the said tool" is correct English. However, it has a jargony feel that may not be quite what you want here. You may as well say "this tool".
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Anonymoushand-shovel.If you are referring tohttps://www.google.cz/search?q=trowel&biw=1366&bih=643&source=lnms&tbm=isch&sa=X&sqi=2&ved=0ahUKEwjKysm936fKAhWGaxQKHVA