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Laura, this mount will accept lights from 5/8" to 1" in diameter. The light is activated by a switch on the rear of the grip. There is also a provision for a pressure pad on the right side of the vertical grip that can also be used to activate light. A lock-out switch prevents the light from being activated unintentionally. --- https://www.budsgunshop.com/product_info.php/products_id/83353/streamlight+88040+protac+hl+led+33%2f600+lumens+cr123a+%282%29+aluminum+black