The 3/16 Csk Alum/Steel Rivet max. 25.4mm is built to exacting standards, constructed from Aluminium & Steel, featuring a 4.8mm (3/16) diameter with a polished finish, with countersunk head style, requiring a 4.9mm hole, accommodating a grip range of 22.4-25.4mm, measuring 30.6mm in length.