The Novagrade universal Tablet Adapter fits most tablets from 7″ to 13″ in size. The solid anodized aluminum construction means years of reliable service. With just one fingertip clamp the adapter can be rapidly adjusted to fit different tablets in field. Compression rings included for eyepieces from 39mm to 60.75mm in diameter.  (Optional Small COMPRESSION RING set available for eyepieces less than 39mm for sale HERE)