Do I need both 2mm and 2.5mm T-handle wrenches?

Yes if you work on cleats and brake levers. The 2mm covers cleat micro-screws; the 2.5mm covers Shimano lever clamp bolts. They are different sizes and not interchangeable.

Can a 2mm hex strip small bolts if over-torqued?

Yes — 2mm bolts on bike components typically have very low torque specs (0.5-1.5Nm). Use feel only; never force a 2mm bolt. The T-handle gives good tactile feedback for avoiding over-torque.

Birzman

Birzman 2-Way T-Handle Ball Point Hex Wrench 2mm

Name: Birzman 2-Way T-Handle Ball Point Hex Wrench 2mm
Brand: Birzman
SKU: CMB_WOW_BM08-HK-TBAR2.0_Std
Price: 450.00 INR
Availability: InStock
Author: InstaSport Editorial

₹450.00

Description

Features: Material-SNCMV / High polymer (wrenches) / SPHC (stand) 2mm hex key Size-150mm x 60mm