Stainless Steel Screwdriver Graver Sharpener Screw Driver Watch Jewelry Repair Tool This is a new screwdriver sharpener. *Great for the professional or hobbyist. The spring loaded to holds the screwdriver firmly in place. *Holds screwdrivers max up to 5.6 mm in diameter. Stainless Steel wheels are carefully set into the body to provide even action when wheeled over stone. It measures approximately: 47 mm. ** Screwdriver not included 100% New,Never Used Before.