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Length: 100mm.
Particle size: 180#.
Net weight: around 60g/set.
Material: green carbon oil stone.
. Shape: blade, semi-circle, rhombus, triangle, rectangle, cylinder(as the pictures show).
Features: Made from the green carbon oil stone, the tool has a hardness only second to boron carbide. The green oil stone is hard, tough, sharp and highly thermal condcutivity. Used to polish and grind the optical glasses, hard alloy, titanium alloy, gems and jewelry, knives made from high-speed steel, heat elements, ceramics and etc. Package Included: 1set/6pcs Green Carbon Oil Stone Polishing Grinding Tool