Parts Required For S&W Factory Rear Sights
MAGNA-TIP® Bit, made to fit the windage nut that secures the S&W rear sight leaf. To use: Drill out staking, hold nut with Spanner and unscrew the screw. To install: Hold new nut with Spanner and seat screw. Always turn the screw; never the nut. Because it is fragile, and can break if you turn it, the Spanner is not guaranteed against breakage.
Big Book Catalog, Issue:66, Page:297
Big Book Catalog, Issue:66, Page:455
SPECS: 1½" (3.8cm) long. .154" (3.9mm) diameter.