Dowel Pins, Dowels or Cross Dowels are used for precise alignment of two objects, dowels can be used as either locators during construction or as joiners. They can be inserted into slightly larger diameter pre drilled holes for a loose join or pressed into slightly smaller holes for a firm join, the pins are machined to tight tolerances as is the hole which is often reamed. Dowels are used in place of bolts which can often leave a small amount play or movement in the joint or alignment. Dowel pins can offer a faster and cheaper alternative to conventional fasteners. Anzor stocks Dowel Pins in 304 and 316 Stainless Steel and in sizes ranging from M2 to M6 diameter.