The PRL-36 Precision Dovetail Rail is an easy to use 36 inch rail compatible with PRC Series Carriers. The rail/carrier system is designed to provide maximum versatility in minimum table space. The PRL-36 is compatible with English or metric table hole patterns. It is made from precision-machined anodized aluminum for excellent linearity and smooth carrier translation.The compatible PRC Series carriers are also easy to use and may be removed or installed at any point on the PRL-36 rail. The aluminum carriers ride on extra-hard polymer pads, selected for low friction, resistance to cold flow, and long life. The overall nominal height of a carrier mounted on to a rail is 1.256 in. (31.9 mm). Convenient thumb-adjust lock knobs securely clamp the carriers in place anywhere on the rail.