Lightly used DMT (Diamond Machining Technology) double-sided DiaFold general purpose folding diamond whetstone sharpener #FWEF. One side has fine grit (red, 25 micron, 600 mesh) and the reverse side has extra fine grit (green, 9 micron, 1200 mesh). Each whetstone measures 4.33”x0.875”. Compact design, good for taking camping, fishing, hunting, etc. Made in USA. Genuine DMT product. I am the original owner. I own a few of these sharpeners, selling this one to consolidate.