This product has three different sizes, so you can cut off the right size. You can choose which size best fits your frame and cut it off where needed. Then, place it in the sawn-off frame with one half in the frame part and so that the other half disappears in the hoop. Weld on it. Leave about 2.5 millimetres in between as this is where you are going to weld. Once the insert is properly welded, it gives a great reinforcement for both frame parts attached to it.
Large to small
Outer diameter of the frame tube: 28 mm. Outer diameter of the insert: 23,7 mm
Outer diameter of the frame tube: 24,5 mm. Outer diameter of the insert: 20,7 mm
Outer diameter of the frame tube: 22 mm. Outer diameter of the insert: 17,7 mm
Length per piece is 32mm long. So it is advisable to buy two units so that each side of the frame can be put in a piece of 32mm long. If you don't want this, you can cut it in half and insert both sides 16mm. However, this is of course less sturdy.