... kind of special fastener ------------------------------------------------------------------------------------------------------------------------------quick release pins,ball lock pins,self lock pins,positive lock pins,detent pins,lock pinsstandard of ball lock pin:Handle ... ,1/4,5/16,3/8,7/16,1/2,9/16,5/8,3/4,7/8,1(inch) or 5,6 ... ,8,10,12,14,16,20,22 ...