Column Base Plates and Mechanical Equipment - Dock Bumpers and Support Ledgers - Racking and Railing Attachments The Sleeve anchor is a heavy duty sleeve style, self-locking anchor which is vibration resistant and removable. Expansion occurs at two locations within the drilled hole. First, the cone is pulled into the large triple-tined expansion sleeve, developing a mid-level, compression force. Further turning causes the threaded bolt to advance into the threads of the expander cone, forcing its four sections outward. This action engages the base material deep in the anchor hole, greatly increasing the holding power of the anchor.