The Lyman Sight 20 MJT-LJT Insert Set for Series 20 and 93 features a larger 7/8" diameter tube and offers the shooter a brighter and larger field of view. It includes two posts and five apertures inserts. Accepts Anschutz style inserts. It features blued steel and 3/8" dovetail. Height is from bottom of dovetail to center of aperture.