Easy to install, fit in H style 3-wire single circuit track system, track rail NOT included. Light Direction Adjustable: Adjust the positioning with a horizontal rotation range of 350 degrees and a vertical rotatable range of 90 degrees. Bulbs not included: H Track Lighting Heads work with standard E26 light bulbs, up to 60W max. Easy bulb replacement(Bulbs Not Included). H Type Track Compatible: Specifically designed for single-circuit H-type track lighting systems(Track Rail Not include, not compatible with J or L track). Clear Glass Shade Included: The black track lighting head is equipped with a clear glass shade, which enhances the visibility and clarity of the emitted light, adding to the Retro Vintage Style 4 Pack H Track Lighting Heads E26 Track Light Heads Modern Pendant Track Lighting Fixtures Ceiling with Clear Glass Shades for Kitchen, H Track Lighting Rail System Compatible (No Bulbs)