The 5/32 Csk Alum/Steel Sealed Rivet max. 6.4mm is engineered for precision and durability, constructed from Aluminium & Steel, featuring a 4.0mm (5/32) diameter with a polished finish, with countersunk head style, requiring a 4.1mm hole, accommodating a grip range of 4.8-6.4mm, measuring 11.9mm in length.