Spyderco Fine Grit Benchstone Because Spyderco's benchstones are flat and broad they are highly effective for honing wide wide tools like plane irons, chisels, large blades, woodworking equipment, ski edges. Available in Fine, Ultra Fine and Medium grits, each stone is sold separately and comes packaged in rigid polymer storage cases with non-skid rubber feet. Use dry without lubricant or oils. To claen scrub with scouring pad and powdered abraive cleaner, air-dry.