Specification:
T6 6061 Aluminum
Fits .223/5.56 (AR15) spec.
Anodized black matte finish
Black color
Monolithic top rail(21mm)
With KeyMod mounting slots for quick and easy installation
Lightweight design
Clamp mounting design , more easy installation
Steel Barrel nut
Barrel nut inside diameter: 1.02 in (26mm)
Barrel nut outside diameter: 1.35 in (34.4 mm)
Mounting thread spec.:   1-1/4-18 UNC
Package:
one handguard+screw+Barrel nut +wrench

Model no. : FKH-7
Length:  7 inch
Model no. : FKH-9
Length:  9 inch
Model no. : FKH-10
Length:  10 inch

Model no. : FKH-11
Length:  11 inch

Model no. : FKH-12
Length:  12 inch

Model no. : FKH-13.5
Length:  13.5 inch

Model no. : FKH-15
Length:  15 inch