Ursa Series is available in six grit combinations

neither calibration nor adjustment of clamps for different shapes of knives is not required

This clamp has modified jaws shapes and in conjunction with special screws provides a minimum possible angle of sharpening

Sigma Power Ceramic stones are made of aluminum oxide

arkansas black stone kmex Ursa Series is available inDan's Whetstone Black Arkansas sharpening stones are used for finish sharpening knives on KME or Hapstone knife sharpeners. Arkansas stones are made of novaculite, a naturally abrasive material of high density. Arkansas stones are mined in the Ouachita Mountains in the state of Arkansas in the United States. Arkansas stones consist of silica, but unlike synthetic abrasives, do not consist of individual abrasive grains of the same size. Arkansas quartz