Wera 9661 Magnetic rail B Impaktor Deep Imperial 1 socket set, 3/8" drive, 9 piecesSocket rail with 9 long Impaktor sockets, 3 8". The Impaktor technology ensures higher than average service life even at extreme requirements. Long design to work even on low lying couplings and protruding thread rods. The hexagon profile offers the transmission of high forces and loads the edges of the bolt or the screw head less than a double hexagon profile. With Take it easy tool finder with colour coding by size for quick and easy identification