Vintage Sheffield Adjustable Spindle Kit. I'm not familiar with this kind of tool, but one of the images is a page from their documentation that explains its primary utility. Other than some very minor surface stains here and there from long storage, it's in excellent condition. I'm not sure it's ever even been used. According to the documentation, it looks like you'd need a Sheffield Precisionaire Air Gauge, for which you can find a number of listings on Ebay. Note that there's no air hose; everything you see in the pictures is what this includes. Sold as-is, so please look at the pictures carefully. Thanks.