Steel setscrews with 1/4-20 thread and nylon-tipped for fixing the Fixture Block to the rail. Use as replacements or spares or for any other use where a non-marring setscrew is required.
The nylon pad protects the surface the setscrew is locking against. In a Fixture Block, the setscrews can be replaced by nylon-tipped Thumbscrews for toolless operation. These setscrews can also be used with BT3K T-Nuts to make stop blocks in the rail slots.
![](../images/preciis/setscrews2.gif)
No, the picture does not show actual size. If it did, we would not lose so many when they fall on the floor.
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