I bought these 12mm and 16mm high linear guides in different lengths and support blocks. All pillow blocks have a hex screw to adjust the tension of the pillow block on the linear guide, which I think is a good feature. In all my purchases of these rails, all rails and blocks have been well wrapped in bubble wrap and in excellent condition. I didn't see any flaws or dents on the bearing surfaces. There is no sign of rust as the steel rails are well oiled and bubble wrapped. I have purchased several diameters and lengths so this is proof that I am 100% satisfied with this company and their products. When I need more parts for my CNC router project I buy this type of rails/blocks. Each bearing block requires (4) 5mm metric screws to attach the blocks to the surface you wish to bolt them to. The threads are fine, the screws are tight in the blocks. RogerLouisSeptember 3, 2017
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