Firth Grey Block 190 x 390 x 140mm SKU: 431427 MODEL: 1509 Sorry, there is currently no online price available for this product.Contact your local store for pricing and availability. Mitre 10 SAvailable at selected stores. Check your local store for details Variants Rebate Whole masonry block 15.09. Features and benefits Hard wearing, durable and dimensionally accurate. Creates the rebate for doors and windows.