The all new Spider Black Label comes glued to a rigid backer with a 5/8"-11 thread for easy mounting.  Super thick design allows for long lasting grinds.  
 
Gaining a ton of popularity for easy, fast grinding, and smoothing out roughness in stone.
 
Available in #0, #1, #2, #3 grits.  
4" in diameter.  
Wet Dry use.