45 Degree Offset Picatinny Rail Mount: Super Lightweight Offset Side Rails with Low Profile Design, Allows the Attachment of Flashlights, or Other Tactical Offset, the 45° Offset Design Creates More Mounting Versatility Eliminating Interference with Vertical Grips, Perfect for Amateurs and Professionals. Fits 21 mm Picatinny Weaver Rail System: The Offset Rail Base Mounted On Standard 21 mm Picatinny or Weaver Style Rail Platform, Ensure Mounting Tactical Accessory Seamlessly. Offset 5 Slots Picatinny Rails: With 5 Slots Picatinny Rail, Allowing You Quickly Add On Any Standard Picatinny or Weaver Accessories. Solid & Durable Precision Machining of 6061 Aluminum Alloy In Black Matte Anodizing Finish and High Tensile Steel Screws, Weight: 1.06 oz/30 g, Durable & Lightweight Construction Don't Worry Wobble or Shake. Quick Release & Easy To Install Simple 2 Built-in Locking Screws Design On the Side, Easy and Quick to Remove or Mount, It Can be Installed Left or Right. Note: Before install, Make Sure to Loosen these Screws, After Inserting Into the Picatinny System, Tighten the Two Screws with A Allen Wrench to Achieve Firm and Stable Effect.