These attachments are no longer in my "big" local hardware store but luckily I found them on Amazon, we only use 3 sizes but these attachments don't have a VERY aggressive tip which does They are ideal for drilling fittings on new cabinet doors. Many of the brands we tried are so aggressive that they can rip open the front of the door. Of course we only use 3 sizes and most of the time you have to buy a whole 16 to 24 bit set just to get the few you need to replace. I will buy again.