1Back Cover Installation: You can repair or replace the watch back cover by yourself without going to a watch store for repair and replacement, practical for use. 2Multiple Applicable People: One of necessary and important watch parts for watchmakers and watch repairers, simple operation, precise and reliable for use. 3Replacement Parts: Professional design and reasonable structure, help fix the back cover of the watch. Wonderful replacement for the old or broken one. 4Portable Design: 8pcs of watch back case screw are available, small and lightweight, easy to carry, suitable for home and professional watch repair store. 5Stainless Steel: Watch back cover screw adopts stainless steel material, eco friendly, anti rust and anti impact, firm and sturdy, stable and durable for use.