HIGH QUALITY MATERIAL Spring Bar Body is Manufactured from 316L Stainless Steel and the Spring is Manufactured in Tempered 304 Stainless Steel.Designed to fit any watch that uses standard 12mm, 14mm, 16mm, 18mm, 20mm , 22mm, 24mm spring bars. 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 and select the width that corresponds to measurement. QUICK RELEASE Insert and remove in seconds without the need for tools. Simply slide quick release lever with finger.Can Only Be Used With Specifically Designed Watch Bands - Ensure Your Strap Is Suitable For These Spring Bars.