The adjustable siding anchors provide an economical and flexible way to join masonry walls to a wood, metal or concrete structure, while allowing exterior insulation to be installed. The choice of fixing (screws, etc.) is essential to obtain maximum efficiency. This male anchor must be used with a female simple square anchor # BL312. Specifications Made from 3/16'' (4.43mm) diameter wire. Standard 3 1/4'' (83mm) projection dimension (others on request). Vertical adjustment of plus or minus 1 1/2 ''+ 1 1/2'' = 3 ''(75mm) if installed above or below. 16 gauge caliber Sold in box of 500 or individually