SEAT POST BOLT, SADDLE PIN BOLT ALLEN KEY TYPE 27mm x 8mm QUALITY CRO-MO STEEL
27mm INNER LENGTH (MINIMUM). USES 5mm ALLEN KEY. THESE ARE ALSO SORT AFTER BY PEOPLE WITH QUICK RELEASE SEAT BOLTS THAT ARE FED UP WITH HAVING THEIR SEATS STOLEN AND WANT TO CHANGE TO A QUALITY BOLT TYPE THAT THIEVES NEED A TOOL TO REMOVE.