1 1/4 inch belt buckles are a popular width for suit belts. The heel bar buckles with a leather loop tend to be the traditional look for dress belts but center bar buckles are used often as well. These solid brass buckles and chrome plated solid brass buckles are very high quality and will not break They have to be strong since many in this group are also used for harness buckles. The roller buckles are great pet collar buckles. Medium size dogs tend to have this dog collar buckle.
The 1 1/4 inch size measures the inside part of the buckle. This will allow you to know how much room you have for a leather strap.