This robust lag screw from MacLean Senior Industries features a square head design and is perfect for a range of aerial hardware applications. Engineered with a drive point for effortless starting and enhanced accuracy, its Fetter drive functionality allows for both wrenching and nail-like driving, streamlining installation without compromising on holding strength. The rolled threads and upset shoulder ensure a snug fit in mounting holes, making this 1/2 x 4 inch screw a reliable choice for secure connections. Constructed from hot dip galvanized steel, it provides a durable and corrosion-resistant solution for various outdoor settings.