Where Single Harness is used, Breeching straps are the means of connecting the breeching to the vehicle to allow braking.These breeching straps come with stainless steel rein/parrot snaps. This design allows the breeching straps to be left attached to the vehicle shafts, and the snap is fitted to the breeching ring when under harness. Small - 102cm (40") long, 19mm (3/4") wide for Pony size Classic Medium - 114cm (45") long, 25mm (1") wide for Cob size Classic, Elite, ZGB Large - 127cm (50") long, 25mm (1") wide for Full size Classic, Elite, ZGB One Size - Sold as a PairThe parrot clip should always be attached to the horse end rather than the vehicle end. What are breeching Straps?The breeching straps are used to connect the vehicle to the seat of the Breeching to allow braking. When going downhill the vehicle will want to run forward which will tighten the breeching around the horse's bottom through the breeching straps.