Drilling Tools were designed for drilling needed holes in holes in greenware by hand. The DR2 is a high carbon drill, DR4 is a cold roll drill, and the DR6 is a #60 high speed drill. In the picture, the DR4 is the one in the middle with the short, wide drill bit. DR4 (1/4")
WARNING: This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.