Bi-directional plate. This small, bidirectional plate with centered slot is ideal for most spotting ’scopes and is a handy plate to keep on hand. The B6 has an anti-twist flange, and a top surface that’s 1.5" long (front-to-rear) by 1" wide. Or, if your ’scope has a materially “fatter” foot, then use the B76 plate (1.9" long by 1.75" wide).
The B6 is also suitable for some smaller camera bodies. Images at left show the Canon EOS-100D (Rebel SL1) with B6 plate mounted.