rchanter

I use it for M6 alloy rivnuts and take small bites. Big steel pop rivets are hard to pull up with these tools so not enough leverage to pull up steel rivnuts I would think.

These ones are metric 6mm by 1mm pitch, you can get larger but you are unlikely to be able to do much more than 8mm with this setup, smaller are also available but limited by the length of the bolts used to pull them tight.