d4 [Size] 3.5mm (1 piece) [36-piece Engraving Set] This is a letter stamp engraving set recommended for original leathercraft production. It includes 26 stamps for alphabets A-Z and 10 stamps for numbers 0-9, along with a handle. [Rust-resistant Stainless Steel] The stamp part is made of stainless steel. The handle is made of stainless steel. It is made of durable and highly durable materials, and is easy to handle even for beginners. We offer sizes of 3.5mm and 6.5mm. [Easy to Use] How to use: Simply set the stamp of the character you want to imprint on the handle, hold it vertically, and strike it with a hammer. You can engrave clearly and without blurring if you do it on a stable base such as a metal palette. [Handmade Essentials] Can be used for handmade leathercraft such as keychains, pet collars, name tags, accessories, and wallets.