Is this a rare piece for Technic collectors?

While it's a common connector piece, the 2007 Technic theme adds collector appeal to this bulk pack.

What is the specific set number for these pegs?

The set number for this pack of 100 pieces is 991337-1.

This item is specifically for the Technic theme.

Name: LEGO Connector Peg with Axle (Pack of 100) (991337-1)
Brand: LEGO

Technic

Technic · 2007

Theme · TechnicPieces · 100Set Number · 991337-1Year · 2007

Used

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New / Sealed

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Converted from USD at the ECB reference rate — sold comps are US-market sales.

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Is this a rare piece for Technic collectors?: While it's a common connector piece, the 2007 Technic theme adds collector appeal to this bulk pack.
What is the specific set number for these pegs?: The set number for this pack of 100 pieces is 991337-1.
What theme does this LEGO component belong to?: This item is specifically for the Technic theme.