1.Chemical Resistance:The Coating Material Applied On The Zinc Material Will Have Strong Resistance to Rust, Water and Corrosion. No Erosion/Corrision/Deformed Will Incurr. 2.Size: The Numbers Are Around 6 Inches Tall and Easy to Read From A Distance Reduce The Chance of Missed Deliveries or Lost Visitors with These Large Wall Mounted Address Numbers.We Provide Two Size of Stainless Screws,If The Mounting Place Is Thin,Pls Use Short Ones. 3.Shadow Address Numbers :These Floating Address Numbers Create A Great Shadow Effect ,Making The Numbers Stand Out.Try Aiming A Focal Light On Them for A Nice Nighttime Visual Effect. 4.Easy Installation : House Number Is Equipped with A Sufficient Screw Set and Operating Instructions for Your Convenience,You Need Only Pre-Drill Into The Surface Then Screw In The Numbers, Installation Is Just A Piece of Cake. 5.Mutil-Applications: The Black Metal House Numbers Can Add Visual Appeal to Any Space That Needs to Be Identified, They Can Be Widely Applied In House, Garden, Mailbox, Street,office and Shop Etc. Make Your Places Be Unique and Visual.