Feature●D 1 size: 1.1 inches (28 mm)●D2 size: 1.0 inches (25 mm)●L: 0.45 in (11.5 mm)●Size L: 9.8 inches (250 mm)●Weight: 10.6 oz (299 g)●Compatible Ring Pins: C-Ring = 1401C, Pin, O-Ring = 1401A, B CompatibleDescription 1/2 (12.7 mm) SQ. Impact Universal Extension Socket, Total Length: 9.8 inches (250 mm), 0.7 inches (19 mm), 14146M.250-19