The EZ-Align Shelf Pin Jig is a dual drilling jig that allows you to drill two rows of shelf pin holes that are perfectly aligned This eliminates that chance for rocking or wobbling shelves. The EZ-Align jig also provides perfect vertical spacing of 1-1/4" (32mm) between pin holes. Two dual purpose star indexing pins are included to make aligning of your holes a breeze. Each pin can index either 1/4" pin holes or 5mm pin holes (both the 1/4" & 5mm self centering bits are included). The jig also features a 50mm index from opposite side of the jig for larger or wider shelves. Works with both existing and non-assembled cabinets. The EZ-Align Shelf Pin Jig is the perfect for those who want to get it done right the first time. The Perfect Jig to align both sides of your shelves to prevent that annoying wobble., Weight: 0.75 Pounds, Manufacturer: Peachtree Woodworking