Filters are decent but paper is brittle after wetting them them after lifting. The supplied plastic nuts are 100% unusable. They are threadless and will not hold the filter in place if dirt builds up in the filter. The weight of the filter, even when new, goes down if you lower the vacuum too far. In this case, there is a risk of dirt being sucked into the engine. RESERVE YOUR OLD NUTS and toss the ones in this set straight in the trash.