Profile Design A 3 Reach Extender Park Tool DT-2 Rotor Truing Fork You can find really detailed

You can find really detailed instructions from the manufacturer here

Made in the UK

5 mm teeth and 58 and 60 have 2

As is always the case with small companies without a sponsorship budget

Outer diameter: 22

Profile Design A 3 Reach Extender Park Tool DT-2 Rotor Truing Fork You can find really detailedProfile Design A3 Reach Extender More reach for your aero position The A3 Reach Extender from Profile Design extends the pad reach of your A3 base bar by 30 mm, supporting the latest trends in time trial and triathlon riding positions. Ideal for riders who prefer longer, more stable, and more aerodynamic riding positions. +30 mm range: More length = more speed potential +25 mm height: Perfect adjustment to your desired position Compatibility: Suitable