Bulk Packaged Dremel - 2pc Carbon Motor Brushes without springs. We do not know what these fit. We got them in a bulk purchase with other bulk Dremel motor brushes that matched up to our inventory. These measure: 13/64 x 13/64 inch and the spring pole is 5/32 inch in diameter. The do not have grooves down the side and the motor surface is angled and rounded.