The present invention is a structured abrasive article including a substrate having a first major surface and a second major surface, and a plurality of shaped abrasive composites. Each of the shaped abrasive composites includes a bottom surface in contact with the first major surface of the substrate. Each of the bottom surfaces takes the shape of a concave polygon and each of the concave polygons has a convex hull having n sides.

The present invention is a structured abrasive article including a substrate having a first major surface and a second major surface, and a plurality of shaped abrasive composites. Each of the shaped abrasive composites includes a bottom surface in contact with the first major surface of the substrate. Each of the bottom surfaces takes the shape of a concave polygon and each of the concave polygons has a convex hull having n sides.

Representative embodiments of devices and techniques disclose improved tools and tool sets for simplifying and improving the process of preparing or fixing skateboard obstacles to make the obstacles more skateable. For instance, the devices and techniques can be used for smoothing and preparing the surfaces of concrete (and other material) surfaces and edges to improve them for use with a skateboard. The tools can include a brick tool, a broom tool, and an adjustable handle, and a tool set can include at least one of each.

Representative embodiments of devices and techniques disclose improved tools and tool sets for simplifying and improving the process of preparing or fixing skateboard obstacles to make the obstacles more skateable. For instance, the devices and techniques can be used for smoothing and preparing the surfaces of concrete (and other material) surfaces and edges to improve them for use with a skateboard. The tools can include a brick tool, a broom tool, and an adjustable handle, and a tool set can include at least one of each.

Example implementations relate to a sanding tool having an intermediate adapter pad. The sanding tool includes a rigid base plate configured for releasable attachment to a number of sanding handles. The sanding tool also includes an adapter pad that comprises: an upper portion configured to receive the rigid base plate, the upper portion including a perimeter portion that extends above an upper surface of the rigid base plate; and a lower surface configured for releasable attachment to a lower pad, wherein a lower surface of the lower pad is configured for releasable attachment to a working material. The perimeter portion includes a channel configured to receive a bristle ring.

Example implementations relate to a sanding tool having an intermediate adapter pad. The sanding tool includes a rigid base plate configured for releasable attachment to a number of sanding handles. The sanding tool also includes an adapter pad that comprises: an upper portion configured to receive the rigid base plate, the upper portion including a perimeter portion that extends above an upper surface of the rigid base plate; and a lower surface configured for releasable attachment to a lower pad, wherein a lower surface of the lower pad is configured for releasable attachment to a working material. The perimeter portion includes a channel configured to receive a bristle ring.