This item is great for setting up your zero on your workpiece with a boss or hole.Also great for centering up on round stock.Works with indicators with dovetails or you can use a 1/4 inch rod.Fine adjustment makes it very fast and easy to use.Can de used in vertical or horizontal position.Can be used with 1/4 ,3/8 , or 1/2 inch collet.Great little item.

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