Extra Long M4 x 30mm - Helpful when fitting larger cassettes (often as part of 1x Conversions). Example in first photo.
Shimano 105 R7170 Di2 12 Speed Front Mech And Rear Mech Derailleur
Shimano Sora 3500 Road Bike Rear Mech Derailleur 9 Speed, Black
SRAM Rival 1 Long Cage Rear Mech Derailleur Road Gravel Bike 11 Speed 6837-J7
Shimano Deore RD-M5100 Rear Mech Derailleur - 11-speed, Shadow - SGS Long
Shimano 105 RD-5700 Tension Guide Pulley Unit Set Rear Mech Derailleur Genuine
SRAM X-4 Long Cage Rear Mech Derailleur MTB Hybrid Bike 7 8 9 Speed X4 2713-K10
