Summary from PJAMM Ambassador Stephen Rochford, Longwood, Co. Meath, Ireland.
This is a 5.8km long climb with an average gradient of 4.7% in the heart of the Sleive Bloom Mountains that straddle the Laois/Offaly area in the midlands of Ireland. It is a very secluded area with almost no traffic on the climb. The road is narrow and sheltered by the surrounding pine forest for most of the climb. The surface is fairly good but there are some rough patches and if descending there can be leaf litter and loose chips in places so care is necessary.
The climb starts easily enough after a very short first ramp that hits about 10%. Then is a section about 2km long that is little more than a false flat with a couple of short ramps and descents. However with 2.5km to go the road kicks up very quickly and averages almost 10% from there to the top with a maximum gradient of over 15%. There are some lovely views at the lay-by near the top but the road does continue upwards for another half a km before reaching the top of the pass. The climb from the other side of the mountain is detailed here https://pjammcycling.com/climb/3218 and is a longer climb but doesn't have the same steep gradients,