Norton Sharpening Stone Case, black (IM50B). Store title: black sharpening stone case. Official IM313 systems are listed with a black case on nortonabrasives.com; a current standalone product page for this article was not confirmed at draft time. Copy uses the store title plus the IM313 case color from Norton's multi-oilstone page.

The black stone box. Confirm it matches the stone length on the shelf before going live.