Does this work with BSA (English threaded) and Italian threaded frames?

Yes — the socket profile fits the BB cup regardless of thread standard. Both BSA (1.37" x 24tpi) and Italian (36mm x 24tpi) threaded shells use the same Shimano Hollowtech II cup profile that this socket engages.

Do I need a Park Tool BB holder to use this?

For removal, a crank arm on the spindle holds the BB in place. For installation into an empty frame, a rubber strap wrench or dedicated holder prevents the frame spinning. For most home mechanic setups, securing the frame in a stand and using moderate leverage is sufficient.

Birzman

Birzman Bottom Bracket Socket for Shimano Hollowtech II

Name: Birzman Bottom Bracket Socket for Shimano Hollowtech II
Brand: Birzman
SKU: CMB_WOW_BM18-ABB-S_Std
Price: 2105.00 INR
Availability: InStock
Author: InstaSport Editorial

₹2105.00

Description

The Birzman Bottom Bracket Socket is purpose-built for Shimano Hollowtech II external bearing bottom brackets — the most widely used bottom bracket system on Shimano-equipped road and MTB bikes. It engages all the spline teeth of the BB cup precisely, preventing the slipping and rounding that occurs