Free Float Handguard End Cap For .223/5.56 or .308/7.62  Types Optional 
Come with 4 screws that screw down through pre-drilled holes on handguard 
Two model options  :
.308/7.62(AR10)
.223/5.56(AR15) 

Model no: 
Front End Cap for LR.308/7.62 Handguard 
Material: T6061 Aluminum 
Color: Black 
Fit .308/7.62 (AR10) Spec 
Anodized Finish Matches Handguards 
Inside diameter: 20 mm(0.78 inch) 
Outside diameter : 48 mm(1.89 inch) 
Thickness : 9 mm(0.35 inch) 

Model no.: 
Front End Cap for .223/5.56 Handguard 
Quad Rail Handguard Front End Cap 
Material : Aluminum T6061 
Fit  .223/5/56 (AR15) spec. 
Inside Diameter: 26.5mm (1.04 inch) 
Outside Diameter: 46mm (1.81 inch) 
Thickness : 9.6 mm(0.38 inch) 

Package:  One cap+4 screws+wrench