BLACKHAWK! Low Profile Rail Cover (18 Slot) offers complete rail protection and minimal weight. Each cover offers enough length for 18 rail slots but can easily be cut to size for custom fitting. Constructed of Santoprene for lowprofile, rubbery grip surface, the 18 Slot cover fits most Picatinny spec rails and clips onto the rail without having to remove other attachments. The ladder style cover offers very a very low profile while shielding the operator from sharp rail edges and protecting the unused rail areas from damage.