Stanley rustless metal rules stanley 0 35 401 buy stanley 64r rustless rule 300mm12in an engineer39s precision rules with both metric and imperial graduations incorporating the following features rigid rustless steel material 300mm measuring length 16ths 32nds 64ths 10ths 20ths 50ths 100th imperial side graduation 05mm metric side graduation graduated on both sides and all 4 edges hanging hole stanley 0 35 401 64r rustless rule 300mm12in