6AN ラバー＆メタルクラッシュワッシャー（10個入り）

Finally, a crush washer set that stays in place while I tighten the fitting. The rubber seal on these creates a much more reliable seal around the AN fitting compared to cheaper all-metal washers I've used before.

The metal core in these washers gives me confidence they won't deform under pressure like all-rubber ones sometimes do. Worked perfectly on my brake line fittings and sealed first try with no drips.

Used these on my oil cooler lines and they sealed up nicely on the first try. The metal ring gives them a solid feel compared to all-rubber washers, though I wish the pack had a few more for the price.