The Linear Motion Kit provides a method for VEX builders to create linear mechanisms. Utilize the low friction slide rails for your own mechanisms or combine them with included Rack Brackets and VEX Rack Gears (not included) to build direct driven linear actuators. Each of the plastic slide trucks has self-tapping holes for VEX 8-32 screws which allows for easy assembly.
 
  
The rails have holes on 0.500" increments.
  
Two rail lengths included - 12" and 17.5"
  
Use with VEX 8-32 hardware (not included)
  
Additional Truck Kit contains (16) spare plastic trucks