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These are usually the pen like pencils that you push on the top to release the lead. You also remove the little cap on top and find the eraser. You can buy lead refills for these pencils. When someone buys a nice set of pen and pencil (usually in silver and gold colors), the pencil is known as the mechanic pencil.
Explanation: Hello. Ffc's feeling is right, there goes some text from link below: "OVERCLOKING DEL AMD DURON Y THUNDERBIRD
... cortocircuitos peligrosos. Un truco nuevo y barato es usar un lapiz o portaminas (lapiz mecanico) de grafito."