Here is a set of heavy duty speaker spikes. Its a set of 8 with a 5/16-18 diameter/thread. Length of the threaded end from the base of the nut is 1″ and the height of the spike including the nut is 0.75″. Previous owner said they came off a pair of Thiel speakers but would need verification since we don’t have a pair of Thiel speakers to try them on. You can also use them with your your speakers too if the above specs meet your speakers.