42.25mm long by 10mm wide by 10mm high. Face is 14.15mm by 10mm. Dove prisms are also called image rotators because if you look through the prism and rotate it about a longitudinal axis, the image rotates through an angle twice as much as the prism. Unused. Made of BK-7 optical glass. Surface finish 60-40 with 1/2 wave flatness.