Representative photo. Please check item description for details.
Banner MINI-BEAM: Aperture; Vertical Slotted; 1 x 12.7 mm (0.04 x 0.5 in); For Opposed Mode MINI-BEAM Sensors - QTY 20 (AP31-040V)
https://www.branom.com/shop/27135-banner-mini-beam-aperture-vertical-slotted-1-x-12-7-mm-0-04-x-0-5-in-for-opposed-mode-mini-beam-sensors-qty-20-ap31-040v-18147
https://www.branom.com/web/image/product.template/18147/image_1920?unique=0b1a179
(0 review)