The round-half swedge is most commonly used to help keep the path of travel wider. It might also be used on the back of a Trotter that is interfering.
helps with pacers that crossfire 
The support in the heel area, with a slightly wider lateral heel
Features:
Made with tough, durable steel.
Careful consideration of shoe shape and nail placement.
Support in the heels.
Hinds are all Toe Clipped
Available in sizes 1.5 to 4 Hinds Only