hole saws
the venting seems to be ok but check the amount of diamond encrusted on the hole saws -as for the sanoma brands-these holesaws are good for about 4 cuts through 3/4 glass-thats why i bought one to replace the set gradually that cost me $80 for one bit-when i buy my tools i sometimes buy cheap to get a quick job done then i will gradually replace them with something that will last me a lifetime.the 2"bit i bought i will probably never have to replace where i have worn out 3 of the sanoma bits-as i said you get what you paid for
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