K&N KN-170C Harley Davidson High Performance Oil Filter 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 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 Outstanding Oil Filtration High Oil Flow Rate Heavy Duty Construction Great with Synthetic or Conventional Oil Traps 99% of harmful contaminants