Eurospec SSL1401 MITRED Lever on Sprung Rose:

Concealed Fix
Square Press-on Rose

Dimensions (mm):

Rose: 52x52
Rose Thickness: 8
Projection: 66
Lever Length: 128
Bar: 19x19

Suitable for domestic and Commercial environments.
10 year mechanical guarantee.
Suitable for 30-60 Minute fire doors (up to 240 minutes
where handles are located no higher than 1000mm from the bottom
of the door to the centreline of the spindle/ up to 120 Minutes where
handles are located no higher than 1400mm from the bottom of the
door to the centreline of the spindle).