Features: Constructed by Aluminum Alloy. Easy to hook up， install in seconds. All necessary nuts are included. 4 pieces of screw included Fits G36 G36C Good for DIY Two holes' center distance:8.4cm-8.63cm Package Includes: 2 X Picatinny Rail Set for G36 G36C series - Short 4 X Bolt 1 x Allen KeySpecifications: Material: Aluminum Alloy Weight: 80g Length: 98mm Rail width:20mm Color: Black