This purchase is a kit that includes mounts, bolts and other hardware
The large coupling is best used on boat with an on water weight up to an 8 tonne maximum (couplings may be used on applications over this weight at the owners own discretion and risk, or talk to us and we can explain).
To relate this to approximate boat lengths; large couplings may be fitted to vessels ranging from 6 metres and up to those near 10 metres. If your boat is under this size then you may want to look at using the small Boatcatch.