Spyderco Square Ceramic File Sharpener 400F1S (Fine)
The Square Ceramic File is fine-grit sharpening tool. Comes packaged in a plastic tube. Clean with a plastic souring pad and powdered abrasive cleanser. Autoclave safe.
This file is also available in the Spyderco 400F File Set, which includes Round, Square, Triangle, & Slip stones in a snap-front suede pouch.