Each one of these holding devices fixes to a tool board or workshop wall with a single screw. Mount them either, individually or clipped together in a row. Each is 45mm long, 22mm deep and projects just 35mm. They will grip screwdrivers with bars from 2mm to 12mm in diameter. This will cover the vast majority of screwdrivers, from small precision to large cabinet. A little item that is ideal in the workshop and even better in the van.