Grinding Wheels (Drill Grinders??)

[sneebot]

I have a number of smaller grinding wheels for sale. I assume that these fit some sort of drill grinder.
3 lots:
-(3) pieces Norton 4 x 1 x 1/2" $30 + Shipping
-(3) pieces Doall 3 x 1 x 1/2" $30 + Shipping
-(9) pieces Carborundum 3 x 1/2 x 1/2" $75 + shipping

 

[animal12]

What's the RPM rating on the wheels ?
thanks
animal

 

[michiganbuck]

Looks like 8.120 to 12,400 for the pink one.

 

[animal12]

Brain fart , forgot I could zoom the pic . I'll have to check my grinder rpm. I have a D-handle Dumore grinder that's missing the guard , which shouldn't be a problem to make one .
thanks
animal