Allnice&reg; Stainless Steel Adjustable Watch Back Case Opener Battery Cover Opener Big Size Max 65mm Diameter Wrench Screw Remover Box Repair Tool Kit Watch Case Opener Spanner Wrench Watchsmith Repair Remover Tools For open up to 65mm Large Diameter Simple to use and fully adjustable Tool is made of high quality and durable stainless steel Fully adjustable via thumb wheel, Holds watch in 2 positions