So-called because of the flat sides of the peening head. Small diameter head tapers slightly. Delivers a “seating blow” to tap a short, small pin held between thumb and forefinger.
SPECS:
8 oz. - Overall length 12" (30.5cm). Head, overall, 4" (10.2cm). Face, 7⁄8" (22.2mm) dia. 8½ oz. (240g) head. 10 oz. - Overall length, 12½" (31.8cm). Head, overall, 4½" (11.4cm). Face, 1" (25.4mm) dia. 10½ oz. (300g) head.
Catalog page 436