Overkill Buckle  
Description:
·Patented flip features of the both end of bicycle helmet buckle,which absorb shock force during falling.
Material: Acetal(POM) Nylon/(NY)
Size:  Male/Female  Male/Female 
5/8'' (15mm)  8983*/8984* 9133*/9134* 
*8983,8984,9133,9134 from USA only.