The Lock Up snaffle removes the nutcracker action of the conventional snaffle, meaning it will bear less pressure on the horse’s bars. The Lock Up is, therefore, a softer option than a conventional snaffle, although it still applies tongue and bar pressure when the reins are taken up.
The Square Twist will create more pressure points on the mouthpiece which will make it stronger than the Smooth.
 
BIT WIDTH 
5" 125mm
BIT DIAMETER
B10, B12, B4, B8