Hand of caucasian man holding Japasene knife on sharpening stone and sprinkling water over it

sharpening knife blade stone knifegrinder grindstone rubstone abrasion grinder abrasive whetstone sharp japanese brick table instrument man craftsman twosided tool rubber manual japan water workbench burr craft professional equipment doublesided hold worker hand grinding profession occupation sprinkle male person striker paired workshop caucasian waterstone twoway focus work duplex coupled