The Supertech titanium exhaust valve for Honda K20 and K24 engines is a +1.0mm oversize single replacement supplied individually. The listing identifies titanium construction and the +1mm oversize; this valve is intended for exhaust-side replacement on the stated K-series applications when an oversized titanium valve is required for valve work.
Supertech Honda K20/K24 Titanium Exhaust Valve - +1mm Oversize - Single