The light wasn't bright enough, and his vision wasn't clear enough, to make sense of this ironmongery that was about his neck, so he had to explore that with his hands. It seemed to be a band of iron bent into a neck-ring. From four locations equally spaced around its circumference rods of iron projected outwards like spokes from a wheel-hub, to a radius of perhaps half a yard, where each split into a pair of back-curved barbs, like the flukes of grappling-hooks.