Extra or replacement snap-in stamp handle for 1/4" (6.5mm) and 3/8" (9.5mm) alphabet and number stamps. The snap-in feature holds the stamp head securely on the handle while you position the stamp on your project. The post that fits into the stamp head is 3/16" (4.5mm) in diameter. The tool is 3-11/16" (94mm) long and 5/16" (7.9mm) diameter.