Eraser Wheel has serrations for improved cooling effect air flow.
Dynabrade surface grinding wheel has a diameter of 4 in. The quick change attachment allows for easy mounting to the tool or pad. In addition to the other aspects of these parts, another important component of these is the thickness. This Dynabrade part is 1 1/4 in thick. All abrasive products that rotate or spin, such as the ones in this category, have a maximum speed at which you can run them. This Dynabrade surface grinding wheel can be run at a maximum speed of 4000 RPMs.

Dynabrade 14010 Dynafile Abrasive Belt Tool Versatility Kit
Dynabrade 51450 5"-8" Dia. 7 Degree Offest Two-Hand Rotary Buffer, .7 hp, 3,400 RPM, Rear Exhaust, 5/8"-11 Spindle Thread
Dynabrade 15420 Dynafile III Abrasive Belt Tool
3M 86407, Scotch-Weld Multi-Material Composite Urethane Adhesive DP6310NS,Green, 48.5 mL Duo-Pak, 7100109829, 12/case
Dynabrade 40320 Dynafile II Abrasive Belt Tool
Dynabrade 53270 7" (180 mm) Dia. Right-Angle Disc Sander
Dynabrade 95843 Dynabrade Air Lube 10W/NR, 1 Gallon 
