Simpson 5/8 x 6 Washer Head Titen HD Screw Anchor, ZincModel No. THDB62600WH Coating Material Zinc Plated Carbon Steel Size (in.) 5 8 x 6 Drill Bit Dia. (in.) 5 8 Recommended Fixture Hole Size (in.) 15 16 to 1 Product Includes 1 2 in. socket adapter and (2) T drive bits The Titen HD with washer head is a high strength screw anchor for use in cracked and uncracked concrete, as well as masonry. The washer head design is commonly used where a minimal head profile is necessary. The model is offered in sizes