Maypole M16 nuts, bolts and shakeproof washers in a 45mm length pair pack — designed for fitting flange-mount towballs to caravan and trailer towbars. The shakeproof washers stop the nuts loosening under road vibration, keeping the towball securely fixed at the correct torque.

Sold as a pair to suit a standard 50mm flange-mount towball, made to British towing standards. Maypole has been the UK's go-to trailer and towing brand for over 60 years.