This rail is designed to mount a Swarovski ATX, STX, ATM, STM, ATS or STS scope safely & securely. It may be utilised to attach the scope to a tripod or as a simple rest. The rail features button-press quick release for added convenience & the base-plate is of a generous length & hence nicely balances even the largest of scopes, even with attached camera equipment. Designed for use with the Swarovski DH101 Tripod Head.