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Rail Chocks Rail Chocks have replaceable heat-treated steel spurs that grab rails to prevent slipping. Use on exposed rails only. For one directional stopping choose the single rail chock. Double rail chock is needed to stop in both directions (with rubber strap and hooks for greater tension). Meet OSHA regulations. Complete Item # NAME | SKU Description Wt. Lbs. Stock Number Product Code Manufacturer Part Number Qty. Price 1165200 1165200 Double Chock w/Flag 18 WS-517 S C 223.00 1165300 1165300 Double Chock 12 WS-518 S B-4011-03 185.00 1165400 1165400 Single Chock w/Flag 13 WS-519 T "4011-01 ""A""" 161.00