The optech usa system connectors sling strap adapter black is designed to convert most optech straps into an over the shoulder sling the adapter clips onto an optoional strap pad there are 2 uni loop connectors included that allow for use with a pro battery pack and other options for carrying gear when using the adapter the camera or binoculars will glide freely up and down on the sling strap this item is made in the usa strap basics converts most optech str