12pcs Single Picatinny Rail 12 Pack Single Picatinny Rail Designed for Standard Picatinny Accessories, the Polymer Rail Included Screws and Allen Wrench You Need Feature Beveled Ends to Reduce Snagging and Eliminate Sharp Corners and Edges to Offer Durable Safe Performance. Position just Enough Rail Area Exactly. Lightweight and Low Profile Design. Easy to Be Attached and Detached from The Mounts by Allen Wrench. High Strength Polymer. Enhanced Strength and Durability. Machined of a Proprietary Reinforced Composite.