Polished Black Granite Hearth One Joint (inset Stoves)Made to Order Black Granite Hearth One Joint (For Inset & Cassette Stoves) Our custom black granite hearths with a single joint are specifically designed for inset and cassette stove installations. Manufactured in house to your exact dimensions, these hearths offer a cleaner look while allowing for necessary expansion. Custom Sizes Available We produce both standard and bespoke sizessimply click the link and enter your required dimensions. Tip: If