A drive plate attachable to a driven shaft of a floor-finishing machine has a central circular recess and a plurality of radially extending pockets having beveled side edges formed in a surface thereof. Located in the pocket is a rectangular stabilizing bar. The abrasive tool includes a plate sized and shaped to fit into the pockets when inserted from the central recess and having a groove formed therein for receiving the stabilizing bar. On the surface of the tool plate opposite the groove are abrasive members.

An abrasive grinding wheel (10) that comprises an annular body (20) made of abrasive material provided with a central hole (21) and a reducing ring (30) provided with a central attachment hole (32), wherein the reducing ring (30) is inserted into the central hole (21) so that the attachment hole (32) of the reducing ring (30) is coaxial with respect to the central hole (21) of the annular body (20), wherein the reducing ring (30) comprises two opposing enlarged axial end stretches (311 and 312) configured to axially lock the reducing ring (30) to the central hole (21) of the annular body (20).

A backerplate for a portable drywall sander hub assembly includes a mounting portion and a backerplate body. The mounting portion includes a threaded bore adapted to couple the backerplate to a sander hub. The backerplate body is connected to the mounting portion. The backerplate body forms a plurality of apertures therein positioned radially between an outer circumference of the backerplate body and the mounting portion. The plurality of apertures are adapted for dust to pass therethrough during operation of a drywall sander with the backerplate mounted thereto.

The invention relates to a vulcanized fiber grinding tool (1) comprising two vulcanized fiber grinding disks (2, 3) which are adhered to each other over the entire surface by means of an adhesive layer (4) arranged between the vulcanized fiber grinding disks (2, 3) such that the vulcanized fiber grinding disk (2, 3) outer faces provided with the grinding means point away from each other and the use of a support plate is not necessary.

An apparatus may include a grinder blade for flush cutting concrete, the grinder blade comprising: a distal side that defines a flush cutting plane and a proximal side opposite the distal side, and a locking hub receiver section unitarily formed from the grinder blade at a center portion and extending from the grinder blade a proximal direction to receive a locking hub with a plurality of fasteners disposed proximally to the grinder blade to secure the locking hub against the grinder blade.

An apparatus may include a grinder blade for flush cutting concrete, the grinder blade comprising: a distal side that defines a flush cutting plane and a proximal side opposite the distal side, and a locking hub receiver section unitarily formed from the grinder blade at a center portion and extending from the grinder blade a proximal direction to receive a locking hub with a plurality of fasteners disposed proximally to the grinder blade to secure the locking hub against the grinder blade.

A grinding and/or polishing pad device for a grinding and/or polishing machine with a carrier unit is disclosed. The carrier unit on the machine side has at least one air duct, in particular an exhaust air duct, which runs transversely with respect to a main normal of the carrier unit.

A grinding and/or polishing pad device for a grinding and/or polishing pad for a grinding and/or polishing machine has a drive interface unit for connecting a carrier unit of the grinding and/or polishing pad to the grinding and/or polishing machine. The drive interface unit has an offset shape and/or the drive interface unit is designed like a sprocket.