Neo-back Washer, 10x3/4, 5 Pack

Sold as a 5 pack. Stainless steel on one side, neoprene on the other to seal water out. Often called a combination washer.

3/4 inch outside diameter. 3/16 inch inside diameter. Fits a number 10 fastener.

Commonly used in kayak assembly with 10-32 machine screws. The rubber side is to be placed against the hull to seal out water.  10-32-HDW