BYXCO "Manticore" Boat Stone -- "Grade B"

So called because of its curved boat-like shape, boat stones are typically used in the tool and die industry for deburring and breaking sharp edges on large machine parts, but make for an excellent large hand-held stone for bringing a stone to the workpiece rather than the other way around. Think of it like a two-handed puck! One flat face and one textured curved face, with tapered sides for ease of grasping.

An ultra-coarse stone for serious forming, repair, and reprofiling work, the Manticore series of sharpening stones has a bite like no other. Made with ultra-coarse silicon carbide in a homogeneous 80/20 ratio of tough black and friable green varieties in a ceramic bond of carefully tuned hardness. The result is a stone the cuts quickly and aggressively, but without an excessive wear rate. Proudly made in the USA!

The only thing wrong with these examples is they have broken in half during transit.