Mountain Bike Handlebars with 25.4mm Centre

25.4mm is the traditional diameter for the handlebar where it is clamped in the stem. Newer and dearer bikes will often use the larger 31.8mm diameter.

Handlebar MTB Alloy 80mm Rise Black

Light weight and rust proof riser bar for recreational use. These bars have long straight ends enabling them to be used with most gear / brake systems.
80mm rise. 25.4mm centre diameter. 630mm (25") wide. The straight sections for fitting controls are 170mm long. Weight: 300g.

XTech Handlebar 25.4/660/30 Black

An economical alloy mountain bike handlebar.
25.4mm diameter at centre, 660mm wide, 30mm rise, 6 degree back sweep. 6061 aluminium.  Weight: 348g.