Bearing block for 19mm (or 3/4") shafts/round rails.

This is a bearing block for 19mm (3/4") round tubes. It uses four 3x10x4mm bearings and four M3x12mm screws to make a firm and very smooth riding assembly. It needs to be assembled to a slide with other blocks to be stable of course. It is forgiving of imperfections. Not for heavy duty work.