Rail Track screw spike:

Types: 5/8"* 6", 9/16" * 5-1/2", 3/8" * 3-1/2", 1/2" * 3-1/2", etc.

Material: A3, Q235, 45#, 55#, 

Grade: 4.8, 5.6, 6.8

Surface Treatment: Black Oxide, Plain (Oiled)