QUICK RELEASE: Insert and remove in seconds without the need for tools. Simply slide quick release lever with finger. COMPATIBILITY: Ideal for use with NATO style straps or other bands that have been designed for use with quick release spring bars. Will fit any watch that has a lug width measuring exactly; 20mm,24mm. WIDTH SELECTION: To determine proper width, measure the width between watch lugs at the point where the band attaches or consult manufacturers specifications (typically available online). After determining width do the Macarena and select the width that corresponds to measurement. Four per package.