| 摘要 |
PROBLEM TO BE SOLVED: To provide a nail which can be unnailed without damaging a surface of a wood by unnailing pliers. SOLUTION: A pair of V-shaped grooves with a cut thereof expanding downwardly are formed in a head part 11a of the nail 11 at symmetrical positions. When unnailing the nail, claws 16 of the pliers 18 forming the same shape as that of the V-shaped grooves are fitted to the V-shaped grooves, and the pliers 18 are pulled up by an air cylinder 22 to unnail the nail.
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