Detailed Product Description It's called hole saw core bit with sds max,sds plus,sds hex connecting rod,core bit,core bit set,diamond core bit,hole saw core bit with sds max,sds plus,sds hex conecting rod,made by 40cr. Size: 30mm-170 mmMaterial: 40cr, YG8cworking length: 72-160mm We can do as your inquiry. More informations, kindly mail or call us, Thanks for your visiting.