Gedore Spanners & Wrenches Bits 611734 - Gedore 6134280, The Gedore D 19 18 socket wrench bit measures 18 mm and is designed for use with a 1/2" (12.5 mm) drive. This durable tool bit is ideal for tightening or loosening fasteners and bolts in various mechanical and engineering applications. Manufactured by Gedore, it offers precision and reliability for professional use. Gedore 6134280 Socket Wrench Insert 1/2" UD Profile 18 mm