Off-the-shelf Step Blocks and Clamps For Sea-of-Holes Beds

Why do the rear holes need to be threaded?

m6 threaded rod version
http://littlemachineshop.com/products/product_view.php?ProductID=1972&category=11
http://littlemachineshop.com/products/product_view.php?view=classic&ProductID=2039

Having a threaded hole allows you a fast and easy method is setting the clamp height. The clamp should be slightly higher in the back to provide optimal clamping pressure.

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