| 摘要 |
A boat plug has external threads that mate with a boat hole housing, and an end keyed to operate the plug. In preferred embodiments the key has a first end portion that mates with the plug, and a second end portion that mates with a driver. The first end portion, and the corresponding recess in the plug, can advantageously have depths of no more than 1 cm, and more preferably no more than 5 mm. In other aspects of preferred embodiments, the first end portion comprises a recess having irregularities, and independently the second end portion comprises a nut.
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