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 01794 Rubber Drive Wheel
Dynabrade 59339 Vacuum Cuff, 1", w/Groove
Dynabrade 78710 5/16" x 5/8"-B53 Dynacut A/O Mounted Point, 5/pack
Dynabrade 90549 1/2" W x 44" L 120 Grit A/O DynaCut Belt, 50/pack
Dynabrade 11395 Guide Wheel
Dynabrade 95756 Speed Control for Extreme Dynorbital Sanders
Insize 4920-1200, ALUMINUM ALLOY LEVEL (WITH ROTARY VIAL), 48", 6940561980196
Dynabrade NS11 11" Dia. Random Orbital Sander, Non-Vacuum
Dynabrade 92114 1/2" W x 12" L 180 Grit A/O DynaCut Belt, 50/pack
Dynabrade 78055 1" W x 24" L Medium NWN DynaBrite Belt, 10/pack
Dynabrade 40610 Electric Dynafile II Abrasive Belt Tool 
