Magview B1 Binocular Adapter Features The Magview B1 Binocular Adapter is impossibly small yet impressively strong and it integrates with the binocular of your choice. The user slips it onto the eyecup and tightens the retaining screw and that is all it takes. This set it and forget it design does not impede normal use of the binocular which makes the tool an efficient and practical addition to the kit. It fits eyepiece sizes from 38.5mm to 43mm so owners should measure the eyepiece before ordering. Rare earth magnets are built into the adapter and they secure the Magview Phone Plate that is included in the package. Together the adapter and plate create a light fast platform for steady sharp photo and video. The polymer adapter is made in the USA and it gives hunters and observers a way to leave the spotting scope behind. Note that the phone plate is not compatible with wireless phone chargers so users should plan accordingly. MagView B1 Binocular Adapter Specifications Manufacturer: MagView Model: B1 Binocular Adapter Type: Binocular Adapter Material: Polymer Color: Black Compatible Hosts: Binocular eyepieces 38.5mm to 43mm Included: Magview Phone Plate Overall Length: 6.4 Country of Origin: USA Available At: GrabAGun