About 5/8 x 5/8" square. Made for older small Siler flint locks that will not allow the frizzen to close on a 5/8" flint. We stock this odd size flint due to so many requests from our customers.

The finest natural flint occurs as dense grey-black nodules, within chalk deposits. We import these best quality English flints, in quantity, several times each year. We keep a large supply on hand for immediate delivery during the peak summer and fall shooting seasons. However, flints are a rare commodity, entirely hand made, from selected English flint nodules, in a variety of sizes.

Order a few samples, test them, and determine which size sparks best, and lasts longest, in your flint lock. Be ready for match shooting and hunting. English gun flints never spoil, never go out of style.

Does your lock seem to prefer flints that are thicker, thinner, flatter, shorter, longer, or more nearly square? Tell us what you need, and we will do our best to select the best flint for your lock. Or specify which gun or lock you have, in our shopping cart comment box, and we will select the best size, for you. We like these nice flints!