DMT Dia-Fold Flat File Sharpener sharpeners DMTFFX on sale now for $22.15. UPC code 017042011376. Made in USA. 5 1/4" clear handle folds around sharpening file for convenient storage. Extra coarse grit file measures 3/4" at base and tapers to 1/4". Single sided diamond surface flat file is perfect for confined, narrow applications in the home shop or garden. Hang packaged.