A: Thanks for your question. The SR5R000 sanding discs were designed for the Bosch 5 inch/8 hole sanding pads. If your Ridgid has a hook and loop backing pad and the holes match up with the holes in this sanding disc then these will work. If the holes do not match up then the dust collection system will not work properly.
A: The Bosch SR5R000 includes 2 discs each in 60, 120 and 240 grit.
A: Thank you for your question. Yes, the hook and loop backing is a Velcro type backing.