Application: Hexagonal socket screws Design: For manual and machine-operated tools (non-impact), with ball stop groove, knurling at the rear end for manageability during manual use; bit sockets with the advantages of the Wera bit technology; dull chromed; with 30mm long and extra slim profile area for better accessibility in tight workspaces. Take it easy tool finder: With colour coding by size as well as size stamping - to help you find the required bit socket quickly and easily.