Hex Bolt 1.0mm x 8mm Nickel Plated Brass

Precision machined brass / Nickel plated

The width of the bolt head (flat to flat) is 1.5mm.  A 1.5mm wrench is required for 1.0mm hex head bolts.  The 1.0mm refers to the threaded shank of the bolt, not the width of the bolt head.