These two drills, collected from Kearny County, were donated to the Kansas Historical Society in 2016. The lighter colored drill may be made from Alibates flint, a silicified or agatized dolomite from the Canadian River valley in the Texas panhandle. The darker drill is made of an unknown chert type. Drills were used to bore holes in softer material than the drill itself, such as hides, shell, wood, or soft stone.