A: This set of diamond pads is designed to use with polishers and sanders. Orbital sander will work too. It is not designed to work with single speed grinder, but will work with a variable speed grinder. Maximum speed is 4500 RPM. It will work between 1000 to 4500 RPM.
A: These wet diamond polishing pads are designed to be used with 4"/5" wet polishers, with maximum speed of 4500 RPM. The 4" back holder has 5/8-11 thread for polishers/variable speed grinders with 5/8-11 thread spindle. You can use them with a variable speed grinder to dial its speed down to 2800 rpm or 4500 rpm, but not with single speed grinders which typically run at 11000 rpm. You will need to spray water if you use a dry variable speed grinder but need a GFCI to keep yourself safe from electricity.
A: 4 1/2" Grinder with 4" Velcro backing pad to give best result with longest life of both pad and backing pad, too small backer will shorten life of pad, too big backer will shorten life of backer and use all pads in prgession with a lite pressure allowing pad to do the work
A: Yes these pads will work for polishing concrete counter tops. Need to polish with water only.
A: they may. Recommend to use plenty of water while polishing to minimize possibility of staining.