Double container trailer twist lock together

Product Name Double container trailer twist lock one twist lock have different types of : Specification 150mm*150mm 210mm*210mm 150mm*210mm Weight 7.5kg 14.7kg 10.5kg Standard ISO/TS16949:2002 Specification 150*218mm; (218means handle length) Material 　Casting Steel Appearance Red Painting Max Payload: 30000kgs Package 100pcs per wooden box A Trailer need 8 pieces trailer twist lock.