Shelf pin template with 21 inch holes and 17 metric holes. This template is CNC machined from 3/8in thick phenolic sheet. It's the thickest, most durable template on the market. All the holes are 3/8in. diameter making it 100 percent compatible with self centering drill bits, 3/8in diameter router guide bushings with 1/4in. or 5mm spiral router bits and standard drill bits (when used with the optional drill guide. Comes with 6 steel pins for indexing the template on the workpiece.