Jockey wheel 48mm.
Medium duty smooth stem design, suits the Knott KF13, KF13E, KF20, KFG20, KRV20 KFG27 & Alko P0515 couplings.
Suitable for horsebox models HB401, HB403, HB505 HB506, HB510, HB511 on Knott couplings after 1996
Some people also call them dolly wheels, trailer mover, trailer hitch wheel, caster, jack, support leg.
