Steambow Archery SB1x20 Red-Dot-SightThe SB1x20 is a high end red dot sight that stands up to any comparison. Developed with the help of the optics experts behind the leading long range scope systems of Zero Compromise Optics, it delivers uncompromising quality now under the Steambow brand. With its enclosed, ultra rugged housing made from hard anodized 7075 aluminum, the SB1x20 withstands even the harshest conditions whether mounted on a crossbow, air rifle, or firearms up to . 50 BMG.