Otter Screws Hex Head SDS Fine Thread, Class 3 - 12g x 20mm

Engineered for precision fastening in steel applications, these Otter Hex Head SDS screws feature a self-drilling point capable of penetrating steel up to 6.0mm without pre-drilling. The fine thread design delivers superior grip and holding capacity, while the hex flanged head distributes load evenly across flat surfaces, preventing pull-through failures. Cold forged and roll formed from hardened wire for exceptional durability. Ideal for structural steel work, roofing installations, fencing, gates, sheds, and metal panelling. Trusted by builders, metalworkers, fencers, and experienced DIYers who demand reliable performance in demanding applications.