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Watch case lug Delrin dies used to assist in opening screw-off style case backs. Dies fit Horotec case holder 07.360-A and Bergeon 5700 case opener. When used in applicable case holder, dies are made to fit between the lugs of watches to securely hold the case in place while removing or tightening a case back. Available in four different sizes to accommodate a wide variety of different size watch cases.