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 11399 Type 27 Wheel Mounting Adapter Kit
Insize 7341-4S, PIN GAGE HANDLE (with 1pc handle and 6 pairs of collecting bushes),.180-.228", 6928640360732
Dynabrade 94980 1/4" Composite-Style Coupler, 1/4" Male
3M™ 72010, Replacement Filter Kit 523-01-29, 7000056891, 1 EA/Case
Dynabrade 98269 1/2" Female Coupler
Dynabrade 57113 Rotor/Vane Set
Dynabrade 01011 Vane Set (4pk)
Dynabrade 53533 Cone or Plug Grinder (Triple Extension)
Dynabrade 01794 Rubber Drive Wheel
Dynabrade 90614 3" W x 10-11/16" L 80 Grit A/O DynaCut Belt, 10/pack
3M 33647, Cloth Belt 341D, 60 X-weight, 4 in x 132 in, Film-lok, Single-flex, 7010307966, 25 per case 
