3M 87449 Silver Depressed Center Grinding Wheel, T27 Quick Change, 9 in x 1/4 in x 5/8-11 Center Hub Thread, 7010409732, 20 per case 
3M 14915, Roloc+ Button Combination Pack 1 and 7, 1/4 in Shank, 7000120713
This item has been Discontinued. Please see 3M suggested replacement item 7100329866 & 7000045945.
Our 3M Roloc+ Button plays an important role in the 3M Roloc+ Attachment system, and it’s designed to drive 3M Unitized Wheels that contain a 3/8″ inch center hole.
Extended Shank Allows Side Loading
A threaded shank on the 3M Roloc + Button passes through the unitized wheel’s 3/8″ center hole and twists into a Roloc + holder. (Note: The Roloc + holder comes in the 3M Roloc+ Button Combination Pack or can be purchased separately). Then, the 3M Roloc + holder (sold separately) can be mounted on the power tool, most commonly on tools featuring a _? collet chuck. The 3M Roloc+ Button has an extended load bearing shank, which provides added bending strength for applications using Unitized Wheels where side loading occurs.
