Swarovski DRX Adapter Sleeve (ATX/STX to TLS APO/DCB II)The Swarovski DRX Adapter Sleeve (ATX STX to TLS APO DCB II) is the inner sleeve for both the TLS APO and the DCB II digiscoping adapters for ATX and STX spotting scopes. It is required to attach either of these devices to a Swarovski ATX or STX ocular module. It also comes with the these adapters, so is not required unless you want to attach the same outer adapter to more than one ocular module. Since it is required for attachment, this item also