This is a jig for Xtool F1 to laser-engrave bottle openers.

Please be careful: Though they look similar, there are multiple bottle openers with slightly different dimensions available on AliExpress.

This jig is suitable for openers with: 

•  max. width of wood 28mm 
• max length of the wooden part 98.mm
• diameter of metal collar: 17mm

They can be purchased here.