I bought this vise 2 months ago. I knew the vise did not come with instructions. So, I downloaded instructions available on the website of another manufacturer - which I suspect is the vise after which this Grizzly product is patterned. I simply adjusted my rod and screw hole diameters for metric sizes. The vise is solid, heavy, and once installed has ZERO PLAY in its action. Much better than expected. After reading other reviews, I was nervous about buying it, but figured it fit my budget, even if it may not be perfect. What I received surprised me and is a strong and smooth vise with flat mounting surfaces that required no lapping. The installation was simple for anyone who has any woodworking know-how. Note, the guide rods are 20 mm diameter, the main screw is 30 mm, and the support collets are 2-5/16" outside diameter. I hope this helps anyone looking for a great vise for the money.