... the top fastening structure.quick release pins,ball lock pins,self lock pins,positive lock pins,detent pins,lock pinsstandard of ... ~150mm or 1/2 inch~6inchDiameter of shank:3/16,1/4,5/16,3/8,7/16,1/2,9/16 ... ,5/8,3/4,7/8,1(inch) or 5,6,8,10, ... shank:stainless steel,Ally steel.carton steelBall qty:1,2,3,4 Release Pin BPI4-NM1 ...