Simpson Strong Tie Titen HD Zinc Counter Sunk Concrete Screw Anchors. The popular Simspn Titen HD has become a standard anchor on most any job site. The new counter sunk head Titen makes it even more useful. Available in 1/4" and 3/8" diameter in lengths up to 5", it will find many uses where a hex head gets in the way including hollow metal door frames. What makes the Simpson Strong Tie HD concrete screws so popular? Contractors like them for there easy install. Engineers love them for their performance even in cracked concrete. Simply drill the appropriate sizes hole a half inch deeper than desired embedment and drive in. While an impact wrench makes the job easy, it is not recommended when tightening to block. We carry a large stock of most size of the Simpson Strong Tie Titen Concrete anchors. Available in zinc, mechanically galvanized and stainless steel. If you don't see the size or finish you are looking for, give us a call, we have it.