Very strong and corrosion resistant.

These work by clamping the crossbar of  your motor mount or other accessory down to the gunwales.  One end of the jaw slips under the lip of your canoe or boat gunwale and the other end bears on the crossbar itself. 

Bolts are 3/8" x 3" carriage bolts, 16 threads per inch.  Very standard bolt.  If you want longer, you can get them at the hardware store and they will be compatible.

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  Great item for a great price. I wanted 2 packs of the items. The seller was conscientious enough to check with me to make sure I hadn’t misunderstood that there were 2 individual items in each package, making sure I actually want 2 packs, before shipping. That was very nice of the seller...