Linear Guide Rail Set, SFC20 1200mm, 2 PCS 47.2 in/1200 mm SFC20 Guide Rails 4 PCS SC20 Slide Blocks 4 PCS Rail Supports, Linear Rails and Bearings Kit for Automated Machines CNC DIY ProjectLinear Guide Rail Set, SFC20 1200mm, 2 PCS 47. 2 in 1200 mm SFC20 Guide Rails 4 PCS SC20 Slide Blocks 4 PCS Rail Supports, Linear Rails and Bearings Kit for Automated Machines CNC DIY Project Product Features SFC Linear Guide Rail Set SFC20 1200 mm Linear motion guide rail includes 2 x 47. 2 in 1200 mm length SFC20 linear shafts, 4 x SC20 slide blocks and 4 x rail supports. Dynamic Load Per Block: 882 N, Static Load Per Block: 1370 N. Durable & Long