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 11476 Dynabelter Abrasive Belt Tool, Heavy-Duty
Dynabrade 90875 2" Dia. Super Fine NWN DynaBrite Locking-Type Disc, 25/pack
Dynabrade 95842 Dynabrade Air Lube 10W/NR, 1 Pint
Norton 66261014921 - 2" X 1/8" 50 - 80 Grit Coarse Grade Aluminum Oxide Bear-Tex Speed-Lok Rapid Blend Gray TR Non-Woven Unified Wheel, 60 Each
Dynabrade 64404 36" W x 60" L (914 mm W x 1,524 mm L) Metal Capture Downdraft Table, 230 V (AC), Side Exhaust
Dynabrade 11475 Dynabelter Abrasive Belt Tool, Standard Duty
Dynabrade 10690 Filter/Regulator/Lubricator, FRL40, 1/2" NPTAssy.
Dynabrade 95544 Gear Grease, 2.5oz. Tube
Dynabrade 40610 Electric Dynafile II Abrasive Belt Tool
Dynabrade 53270 7" (180 mm) Dia. Right-Angle Disc Sander
Dynabrade 14000 Dynafile Abrasive Belt Tool
3M 22409, Roloc Disc 361F, P120 XF-weight, TR, 1-1/2 in, Die R150S, 7000045103
Dynabrade 40320 Dynafile II Abrasive Belt Tool
Dynabrade 15420 Dynafile III Abrasive Belt Tool 
