Does the Birzman #1 80mm fit derailleur limit screws?

Yes — derailleur limit screws (found on Shimano, SRAM, Campagnolo derailleurs) are typically Phillips #1 or #0. The #1 80mm is the standard size for most shimano derailleur adjustments.

What is the difference between S2 and CrV steel in screwdrivers?

S2 (Silicon-Molybdenum) steel is harder than Chrome-Vanadium (CrV) — typically 60-62 HRC vs 55-58 HRC. The harder tip engages Phillips recesses more precisely and resists cam-out and tip deformation under torque.

Birzman

Birzman Crosshead #1 80mm

Name: Birzman Crosshead #1 80mm
Brand: Birzman
SKU: CMB_WOW_BM08-SD-CROSS-1_Std
Price: 395.00 INR
Availability: InStock
Author: InstaSport Editorial

₹395.00

Description

Technical specifications: Material: Steel / S2 steel in screw portion Material Handle: Rubber Size: Crosshead 80mm (#1)