“The pilot bit will not stay in the adapter! The "flat" where the retaining hex screw needs a recessed hole to keep it from rotating in the adapter, thus no drilling. I had to use my Milwaukee impact/drill without the adapter to finally drill the pilot hole in brick. The pilot bit continued to freely spin while trying to use your 2 1/2" short brick core bit. I just used the core bit without and had to "freehand" the hole. Extremely upset with this pilot/adapter product.”
“These bits didn’t work for what I’m doing tried to drill petrified Wood. They were supposed to work on hard masonry and natural stone but they didn’t work on petrified wood. It was a waste of money”
