Bullard Abrasives 53333 Type 1 Grinding Wheel 

3" X 1/8" x 1/4" 

(25-Pack)

From the Manufacturer:

Small Diameter Cut-Off Wheel.  used for weld grinding, surface preparation 

(welds, steel and iron) - non-ferrous (copper). Secondary application: Stainless 

steel and high tensile alloy.

Treated aluminum oxide grain - medium coarse grit.

 Lightning performance wheels are the “thinner” version of High Energy formulation

 with the same great performance along with a slightly faster cutting speed and a 

smaller cut-line in the material being worked on. 

Lightning wheels are a bit more flexible for getting into tight recesses.