The Health and Safety Executive recommend the use of a flexible hose between the air tool and a quick coupling to isolate the tools vibration This Whip Hose is 600mm long with a 10mm core, 1/4in. BSP fitting and a quick 1/4in. BSP coupler 1/2in. Drive 25mm Drive Depth, 165mm Depth, 68mm External Dia 54mm 6pt (Single Hex)