Check the listing for details. Linear Guide Rail Set includes 2 39.4" SFC16 4 SC16 Slide Blocks&4 Rail Supports. Condition: New. Listed at 49.99 USD. SFC Linear Guide Rail Set: Linear motion guide rail includes 2 x 39.4" / 1000mm length SFC16 linear shafts, 4 x SC16 slide blocks and 4 x rail supports. Dynamic Load Per Block: 774N, Static Load Per Block: 1180N.