The TRUGLO TSX Pro Bow Sight 5 Pin .019 has a tool-less design and unique stainless steel tube pin design for increased durability and brightness. Aperture has a two inch inner diameter. Level is illuminated by luminescent tape. Adjustable 2nd and 3rd axis level with two vertical bars. Reversible bracket for greater vertical adjustability. Markings for windage, elevation and pin adjustments. Includes adjustable rheostat light to reduce unwatned pin clare. Adjustable for left and right handed shooters.