Coil nailers are heavy duty, powerful nailers often used for making pallets, decking and roofing. They generally come in two types – flat and conical – which take different types of nails. Flat coil nailers are usually heavier and generally don’t have an adjustable depth of drive – apart from the FCN57V. Conical coil nailers usually have an adjustable depth of drive, are lighter and take smaller nails.