I have two Brand New Danaher Motion URS3305A-500P-T22TS linear positioning slides. They are very heavy duty. Originally purchased for an industrial application (laser tracking of submerged arc welding) but never put into use. Each slide comes with two limit switches that can attach to the rail for additional feedback situations. They were purchased due to the exceptional moment that can be handled about the slides' axis (ballscrew axis (x)). Please see the specs at Danaher Motions website. I paid $1995 EACH. I want to get $500 each but you must pay acutal shipping charges. Both units were purchased from Motion Industries and I have the URS Stage Report filled out and signed by the inspector at Danaher Motion (image of this is attached). Rail length is 500mm motor is a 23 frame stepper. These are about 3-4 years old but have just been sitting in my closet. Please email or post with questions. Thanks