Newport dovetail linear stage (1" travel) Description: nice dovetail aluminum linear stage. High quality. This one can ONLY be used in horizontal positions because it is a kind of "beta" mount of the old days and the sliding mechanism was still on development (rack and pinion linear basic mechanism). This means sliding is not pre-loaded, so you must not touch it or it will lose its position easily. It has 1" (25,4mm) travel. All holes are threaded 1/4-20 (typical tripod mount thread). Measures: 3x3" (76x76mm) and 0,75" height (19mm). Condition: normal usage marks. Nice working condition. Note: when needed, these items have been de-greased, cleaned, re-greased (with special oil, better than original grease) and checked for missing or damaged parts. Then tested and verified ok. Good functioning is guaranteed.