OD: 1.47"  or 37.4mm,  ID:  1.05"  or 24mm,   W:  1.89"  or 48mm

-  This insertcap fits inside the Tactical RIS Handguard, for attachment of Tippmann US Army Alpha Black, US Army Project Salvo, or 1.05 inch barrel.
-  Comes with 4 x M4x6 socket set screw, Driver: 2.0mm