What can be a thoughtful gift for your guy on his birthday?(something materialistic)

Pick him out.. Take him for dinner and pay for it... Then tell him that he kinda owes you and demand sex from him... Get home and give him all the dirtiest lascivious sex he's been craving... Until it hurts... Him... Lol

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Tools is always a winner!

Food. Guys like food.

massage

Blue tooth speaker

A Tag watch!

A video for him would actually be nice an super thoughtful. Then again that isn't materialistic. I'll leave it up to others to think of a materialistic idea.
(Oh clothes idk. Accessory.)

My girlfriend bought me a really nice shaving kit... Beautiful blades... Wonderful brush... I loved it.. I only shave once a week and I love a really close shave.

A pair of fine leader gloves, or a warm neck scarf...an ink pen....a money clip,....depends.

Depends on a lot of different things.