... 3.longer service 4.competitive price quick delive M16steel hexagon double sided screw bolt namescrew boltstandardDINmaterialstainless steeldimensionm16 sw24 d16*40mmweight0.25kgprocessingheat treatment ... steel ,carbon steel,alloy steel ,Aluminum ,Aluminum alloy,brass ,copper or special for customers main market: German , Japan ,France ,Mid east ...