DMT Duo Sharp Base DMT. This Knife Sharpener from the people at DMT measures 12" x 4 1/2" x 2" with black plastic construction and holds 8" or 10" Duo Sharp whetstone. Don't explore the great expanse of mother nature without the DMT Duo Sharp Base Knife Sharpener. Features of DMT Duo Sharp Base Knife Sharpener: 12" x 4 1/2" x 2" Black plastic construction Holds 8" or 10" Duo Sharp whetstone Can be mounted to bench or has handle for hand held sharpening Package Contents: DMT Duo Sharp Base DMT DMTB8250: Duo Sharp Base