Flat Head Masonry Nails. Hardened Nail Specifically Designed For Fixing To Masonry. Also Suitable For Use In Brick, Concrete And Concrete Blocks. Length: 65mm. KW1-KW17, PA20-PA38, PA41-PA49, PA60-PA78, PH4-PH44, PH49-PH50, PO (Isle Of Wight) TR (Isles Of Scilly) ZE (Channel Isles).