Deluxe Hardness Pick Testing Kit

Picks are made of metals and alloys of hardness values equal to 2 through 9 on Mohs' hardness scale. And because the picks are made of metal, they are easily ground to sharp points which will not break off and which can be easily sharpened. Includes 8 points, 100 grit grinding stone, streak plate, magnet, and hardness chart for 300 minerals plus instructions.