Aluminum layout blocks. Set of 4, each 30cm long. Commercially available blocks are typically 6 inches (approx. 15cm), but these are 30cm, making it easier to draw straight lines on larger panels in one go, reducing the effort of positioning and temporary fixing. Made of aluminum, they offer the following advantages: ✔ Resistant to warping and provide stability ✔ Heavy, so they don't easily shift during work ✔ Durable and reusable We've also kept the price down, so they're recommended for those who find standard sizes insufficient or want to improve work efficiency. Please note that due to the nature of aluminum, there may be minor scratches present from the time of purchase. Also, these are handmade, so please consider this when making your purchase.