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The PROTO® 3/16" diamond point chisel is made from S2 steel and specially heat-treated for greater strength and durability. Cuts V-grooves and cleans out inside corners. Hand-ground cutting edge to the exact angle for cutting through tough metals. Its modified parabolic striking end helps reduce mushrooming and chipping. Black oxide finish prevents rust corrosion. A polished identification panel on one of the flats is marked with the tool number and size in black inlay.