Sealey Impact Extension Bars 3/4in Sq Drive - Sealey AK5506, Drop-forged Chrome Molybdenum steel extension bar. Suitable for use on all types of impact tool. Phosphate finish for added corrosion resistance. Spring-ball socket retainer and drilled head to accept retaining pin. Sealey AK5506 Impact Extension Bar 150mm 3/4"sq Drive