The Midwest Industries Mi Qd Optic Mount technical specifications include:
Works with scopes with up to a 56mm objective
Weight 8.1 oz
Overall length: 5.875 in.
Width of rings: .85 in.
Distance between rings: 2.80 in.
Offset from base to the fi. ring: 1.40 in.
Distance - top of rail to center line of ring: 1.415 in.