I use a KK Ultra 2-Type on my big gelding. I always thought it was a 6" but the catalogue says it only comes up to a 5 3/4"
. It fits my big boy beautifully. I also have KK Ultra weymouth and bridoon bits for my double and another KK french link snaffle for one of my other horses. I find my horses really like them and are quite responsive to them. My only complaint is the price tag, but, I love them and would definitely recommend them!