The top of the Pinnacle stands at 985.8 m (3,234 ft) above sea level, making Sgùrr Dearg the only Munro with a peak that can only be reached by rock climbing.Most walkers and climbers start from Glen Brittle, from where the easiest route involves following the faint path to the Bealach Coire na Banachdich via the corrie of the same name; from here the top of Sgùrr Dearg may be gained via a tedious scree slope interspersed with some easy scrambling.In this case the top of Sgùrr Dearg can be reached direct by scrambling up the broad flank to the left of An Stac and the Inaccessible Pinnacle.The Inaccessible Pinnacle (An Stac in Gaelic), colloquially called the 'In Pin' or 'In Pinn' by mountaineers, was first climbed in 1880 by a pair of Lancashire brothers, Charles and Lawrence Pilkington.They were guided to the foot of the climb from Sligachan via Coruisk and Bealach Coire na Banachdich by a local shepherd called John Mackenzie.