O/E replacement oil filters for most cars, trucks, SUV's, motorcycles, & ATV's 17 mm exposed nut designed for easy oil filter removal Heavy duty construction for extreme conditions Resin-impregnated filter media traps 99% of harmful contaminants Anti-drainback valve (where applicable) eliminates dry starts, prevents oil from draining back into crankcase during engine shutdown K&N powersports oil filters contain a modern synthetic filter media, designed for ultimate flow with less pressure drop, yet engineered for outstanding filtration. K&N powersports 'spin-on' oil filters feature a heavy-duty metal can. Most of these have a 17 mm nut affixed onto the end that allows for easy installation and removal. The 17 mm nut is crossed-drilled so racers can safety wire the filter to their bike.
I use these due to the convenient 17mm nut on the end for installation and removal, although the filtering specs aren't nearly as good as the OEM filter. A word of caution -- this filter is easy to overtighten -- just today I tried to remove it from from my 2010 Road King and it wouldn't budge. The nut on the end is low quality and quickly rounded the corners off, so then I used a strap wrench to remove it -- the filter was on so tig..
I generally have never had issues with K&N quality. The last time I purchased one, the nut on the end was not of any particular size. I tried every American and metric size on either side of the as advertised 17mm as well and none would get a hold of it well enough to loosen the previously installed hand seated plus 1/4 turn K&N filter. I also tried numerous types of sockets (6pt, 12pt),wrenches and anything I could get in ..