... , Dog spikes, square head screw spikes, timber drive spikes, T-bolts, fish bolts, switch & crossing bolts, high tensile strength ... long-term business cooperation relationship with some famous G. E. T manufacturers & distributors in Europe & America & South Africa etc. ... 1/4'' 5.High tensile Description(TC bolt) Torshear type high strength bolts for steel structureMaterialAlloy steel ,carbon steel, ...