Wow, that's exactly what I wanted. It is not visible in the photo but one end block is 10mm and the other is 12mm. The bolt has a 12mm threaded end that goes through the larger block and comes with a special flare nut. The other end is 10mm and fits into another block. It also includes a connector, but it was too small for my stepper motor, but that's not a problem.
Goodyear Ultra Grip Ice SUV 235/65 R17 108T winter
35 Review
Iverntech 400Mm MGN12 Linear Rail Guide With 2 Black Stainless Steel MGN12H Carriage Blocks For CNC Parts And 3D Printer Upgrades
8 Review
Powerful And Waterproof Electric Micro Linear Actuator 12V With Mini Size And Mounting Brackets For Various Applications
11 Review
Iverntech MGN12H Linear Rail Guide With Stainless Steel Carriage Blocks - 700Mm Length For 3D Printer And CNC Machine
9 Review