In true European style, this is the most delightfully redesigned drawer slide tool set you will ever find. And in the interest of full disclosure, I'll mention that I'm leaving the exact same review for the drawer slide jig because one really isn't that useful without the other and because they should be sold together as a single kit. .Blum drawer slides are world class and this tool kit will be very helpful in installing them properly. Yes, you can go without it, but using the kit will help you achieve that perfect, precise fit that you'll no doubt strive for. Extension 2.5mm. The 2.5mm extension tool set also includes a 6mm drill stop. And none of them come with the actual drill bits you need. So: to get it right you will need a drill press, a tool kit, a 6mm drill bit and a 2.5mm drill bit. Four separate elements that should be in one complex set. But once you have them you will be happy. It takes 5 minutes to install these drawer slides.