EXCLUSIVE Otter Underlay Nail 25 x 2.5mm 500g Galvanised SKU: 293249 MODEL: UFAG2525G6 Error. try again later You've successfully joined the club $ 18 .47 pack Available on orders $50 to $1500.More info × Mitre 10 Variants Suitable for outdoor use fixing fibre cement underlay sheeting. Features and benefits Flat head to avoid pull through in soft timbers. Annular shank provides friction to help prevent the nail backing out over time. Diamond point remains true when driven into timber.