Stone Sharpening Den Instrument Arkansas Hard 3.8-4.1x1.5inch Overall length: 3.812 inches minimum and 4.188 inches maximum Case mounted: not included Departure from cited designator: as modified by overall thickness Abrasive material: arkansas stone, ss-s-736 Spec/std controlling data: Non-definitive government spec/std reference: sss736 Overall width: 1.500 inches nominal Manufacturers code: 81348 Material natural hardness designation: hard Overall thickness: 0.438 inches minimum and 0.562 inches maximum Nondefinitive spec/std data: 6 type and b class and 18 figure Stone style: 8 sharpening Iii part name assigned by controlling agency: stone sharpening den instrument arkansas hard 3.8-4.1x1.5"