... with thread screw surface finish:polished SGS audited More than 20 years experience in special fastener field Name: zinc alloy handle /stainless steel ... 8.8,9.8,10.9,12.9,etc Carbon steel Gr.B,Gr.C,Gr.D,Gr.36,Gr.58 ... ,1045,etc Alloy steel 4130,4140,G51150,etc Stainless steel 201,202,301,302,303,304,316,310,430,etc Brass C28000,C37710 ... so that you couldavoid lots of risks. SS304 handle with thread screw