... the top fastening structure.standard of ball lock pin:Handle type: T style,L style,Marine style,Button style,Ring styleGrip ... length of shank:10mm~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 5,6,8,10,12,14,16, ... steel,Ally steel.carton steelBall qty:2,3,4 T Style Quick Release Ball Lock Pins