can you put the back on with this tool?

I use this tool for battery replacement for my old watches. I like it. It's convenient to replace the battery at home. Thank you, Amazon and the seller.

Will this work on a Seiko?

Yes, it works with screw-on or press-on backs

I have a 54mm Invicta watch case size, is the case holder expandable to fit that?

I couldn't find an expansion size in my directions, but when I measured it to the maximum width, it was definitely not over 2" in width. I don't think your watch would fit.

Brand	EasyTime
Model Number	ETU-W8IN1-01
Product Dimensions	22.86 x 10.16 x 2.54 cm; 229.63 g
Color	ブルー
Material	ステンレススチール製。
Power Source	ハンドパワー。
Quantity	14
Included Components	精密ドライバー(ドライバービット5本)、調節可能なケースオープナー、時計ホルダー、ピンセット、クリーニングクロス、2*時計バックケースこじ開け、取扱説明書
Are Batteries Included	No
Item Weight	229 g

腕時計バッテリー交換ツールキット:EasyTimeプロフェッショナル腕時計修理ツールキットウォッチバックリムーバーセット、調節可能なケースオープナー、ピンセット、ドライバー、説明書付き

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