This is a 10-pack of the Fixed Mirror Mount. The cost-saving A-LINE™ LH-1DB Fixed Mirror Mount 10 pack is a convenient and economical solution for mounting Ø1.0 inch (25.4 mm) mirrors, beamsplitters or UPA series 1-in adaptors. The mount consists of a double-bored aperture and set screw to hold the optic firmly, but gently. The holder incorporates an 8-32 threaded mounting hole for post mounting on English SP and MSP Series posts. The front of the holder also has a special 6 mm alignment hole, which can be used with GR Series Guide Rods for fast alignment of several A-LINE™ lens mounts.