Firth Grey Block 190 x 390 x 190mm SKU: 431436 MODEL: 2009 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 20.09. Features and benefits Hard wearing, durable and dimensionally accurate. Creates the rebate for doors and windows.