Firm Hold. Few things are more irritating than having a power tool repeatedly come unplugged from an extension, or dealing with a knotted connection that keeps snagging on framing members or ladders. LockJaw Locking Plug extension cords are designed to put an end to such problems. Sold in 14- and 12-gauge models in lengths up to 100 feet, they have a locking female end that prevents your cord from coming undone. A 12-gauge, 50-foot model costs about $65. Woods Industries, 800/323-9355.

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