A guy called Trevor Peck perfected his Peck Crackers back in the early 1960s, one of the earliest forms of rock protection. Seems that he produced a nylon version at the same time and called it a Ny-Chock, one of which we have here in the collection. Not sure if there were different sizes as we can’t see any advertised in the old equipment catalogues. This one came in a bag full of old gear kindly donated by Ken MacTaggart.