I have a set of these and they were a life saver mounting stuff on a 3/4 Ton chevy frame with 1/2" bolts. No pilot holes just clamped the brackets in place and used the 1/2" drill bit to make a small endentation on center than used my other hand drill with them and went to town. I drilled probablu 40 holes with the same set of 1/2" bits by hand and still work great. I will say that I invested in a stick of Lubricant and that i'm sure helped them last this long. I also I have used the 3/4" ones on my drill press and works great. I just cut a small pierce on the center on my plasma table than use that to center the rotabroach and works like a champ. Also I always used harbor frieght step bits for years but it seems that in the last couple years they just suck. Brand new ones don't work worth a crap even compared to my old ones that have been used a abused. What step bits are you guys using?And again. Invest in a set of these, 2 sets available ranging from super small to 2”, definitely an investment that will open your eyes and make you cry thinking of all the screaming noise you listened to with a hole saw on a sheet of metal
Blair Equipment 11090N Rotabroach Cutter Kit
congats with the family.had a baby on thursday... so didnt get much done....
besides my switches, bitches!! These are now fully mounted. Next up will be figuring out a way to mount Mob Armor/Ipad ... and dash vents. Then maybe some small stuff like outside temp gauge USB and Cig lighters, etc.
I think these might be the vents I go with. Leaning towards restomod air right now. Expensive... but nice looking.