Review on Laniakea Variable Hole Saw - Bi Metal Annular Cutting Tools by James Cypert

I used a 100mm concrete hole saw with an SDS impact drill bit to drill holes in 4" thick concrete blocks. By the time I was halfway through the fifth hole, the tips were blunt and he wouldn't move forward. At $1.50 an inch of material this allows me to drill a hole, it's not worth the money.