? Product information 1. The optional size of the stamp is 4-20mm. (If you choose the smallest size, it should preferably be a letter or simple pattern for best effect.). Size larger than 20mm needs to be customized. 2. If you need to customize the stamp, please upload high-resolution black and white (not grayscale and not colorful) logo in JPEG, PNG, AI, EPS, CDR, JDP or PDF format. 3. The length of the stamp steel rod is 50 mm - 80 mm. 4. The engraving depth of the stamp is 1mm-1.5mm. 5. Black areas of your logo will be raised on a stamp (black areas of Your logo will be pressed into the blank) Note: If the stamp's size is small, you have to note, that it might not be clear because of it's size. For better imagine how your stamp will look on certain size, shrink your image till the size you want, print on a paper and see what You have. ? Applicable Products Metal punch stamp: suitable for stamping aluminium, brass, copper, silver, gold and ect. (also fits for annealed steel and hot stamping on steel) ? Recommendations for using stamps 1. How to use the stamp: For punching use hammer and place the blank on a hard, smooth surface and hit hard. 2. How to deal with stamp rust: Brush with a stiff sponge, then boil in water with baking soda for 10 minutes. 3. How to store the stamp: If the seal is not used for a long time, it is recommended to use lubricating oil for preservation. Note: For bigger stamps from 20 mm it can be hard to get the best result using hammer, so my advice is to use press.