The Ultra D is similar in size and weight to the Ultra O; however it is stronger and has a slightly bigger gate opening.

The open D shape gives a lot of internal space within the biner, which makes it useful for setting up belays. It’s also finding favour as a perfect partner to a belay device.

Features

D shaped locking biner

Strong and lightweight I-Beam construction

Shrouded nose

Generous rope radius

Can be supplied with a captive pin to hold the biner in a specific position and prevent cross-loading

DMM Ultra-D Screwgate