The 1/8 Csk Alum/Steel Sealed Rivet max. 6.4mm meets the highest industry standards, constructed from Aluminium & Steel, featuring a 3.2mm (1/8) diameter with a polished finish, with countersunk head style, requiring a 3.3mm hole, accommodating a grip range of 4.8-6.4mm, measuring 11.5mm in length.