Flag hinge rebates typically come in 3 sizes, 16mm, 19mm and 21mm. 19mm rebate is the most popular. The examples of the 3 most popular rebates are shown below.
Many of our hinges come with packers so you if you are unsure on you rebate you could get a smaller size and use packers to get the perfect height.
Please see the link below or here to see our trojan patriot plus's that come with packers and will be a suitable replacement for most flag hinges.