Aluminum Picatinny/Weaver Section Rail 
Tan Color 
Universal round shape screw 
High quality made of CNC aluminum T6061. 
For Keymod Handguard  Accessory rail section  
Ideal for attaching lights, laser, optics, bipods, and forward grips 
Fits  21mm picatinny/weaver rail 
Width:   0.82 inch (21mm)  
Height:   0.35 inch (9.8 mm)  

5 Slots  
Length:  2.25 inch (57.2mm)  
Weight:  20 g  

7 Slots  
Length:  3.05 inch (77.5mm)  
Weight:  25 g  

9 Slots  
Length:  3.84 inch (97.5mm)  
Weight:  33 g  

Package:  
3pcs Section Rail(5,7,9,each) + screw+Wrench

Carton package size:
4 inch x 4 inch x 1 inch