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Product name: Lock bolt, lock pin Size: 3/16"~1" Collar: Standard collar, flange collar Head style: Round head, CSK head Raw Material:steel Finish: Zinc plated, black phosphate We are specialized in producing LockPin, the dia. Range is 3/16" to 1". with the good quality, it is very popular in Railway and mining industry. If you have any inquiry, please feel free to contact us. Also we Registered Indian RDSO Certs.