These abraders were collected in the 1930s from Kohr House No. 1, a large village site in Saline County and donated to the Kansas Historical Society in 1971. Archeologists call these groundstone tools as they are shaped by grinding. The sandstone abraders could be used as pairs, one on each side, to smooth a wood shaft. All four artifacts were made of Dakota sandstone. The two on the bottom row are in the process of manufacture, enabling us to see how they were made. The Kohr site was occupied by Smoky Hill aspect people and had several rectangular houses. Radiocarbon dates on maize indicate it was occupied during the Early Ceramic period.