Building Materials City in Zhe Jiang?

Hi there, I am actually the supplier of building materials such as (locks set, screw driver, pull of door or pull of drawer, pliers, saws, etc). I would like to do the market research next week to wenzhou, where should I go for these things? Is there other cities that can be recommended to me? The places where been recommended by my friends are YIWU and WENZHOU. Am I on the right track? Thank you