DIATECH30mm HEADSET 25.4mm 1″AHEAD WITH LOCKING ADJUSTER CLAMP 26.4CROWN RACETHIS IS QUITE A RARE AND HARD TO FIND 1″ AHEAD HEADSETMADE BYDIATECHTHIS HEADSET HAS AN ADJUSTER LOCKING CLAMP DESIGNED TO LOCK YOUR HEADSET UP TIGHT ONCE BEARINGS ARE PULLED TOGETHER.WITH ONE OF THESE TYPES OF HEADSETS FITTED, IT MEANS THAT YOU CAN REMOVE YOUR AHEAD STEM WITHOUT THE HEADSET COMING LOOSE, AS THEY ARE LOCKED TIGHT BY THIS CLAMP SYSTEMFOR 30mm HEAD TUBESNOTE THIS IS FOR A 25.4mm ( 1) FORK STEERER ( will NOT fit 1 1/8)BLACK STEEL HEADSET WITH SEMI SEALED CAGED BEARINGS26.4mm CROWN RACE (Most current sets are 27.0mm)WEIGHT 120grams (approx)WE ALSO SELL JUST THE 28.6mm TOP LOCK CLAMP LIKE THIS, PLEASE SEE OUR OTHER ITEMS