Sealing Washers, Copper, M28 x 34 x 2 mm are made to give you a clean, tight clamp while adding reliable sealing under load. The copper construction compresses to conform, creating a dependable seal while still spreading pressure evenly beneath screws and bolts. That flat face helps protect surfaces, reduce marring, and keep joints stable. Pair them with matching fasteners to adjust spacing, improve bearing area, and lock in both strength and seal in one step.