Concrete frame screws are countersunk self-tapping anchors Designed specifically for attaching wood or metal framing to concrete, brick, or block surfaces. Colour is zinc & clear CR3+ Countersunk torx head. Head diameter 11mm. 3 Notches on thread. Partial Hi-Lo Thread. C1022 Harden. Material is Mild Steel.

G.I.R 1&6 Notes to Chapter 73 Notes 1(d), and 1(f) to Chapter 72 of the Combined Nomenclature (CN); Note 3(a) to Section XV of the CCT; the wording of heading 7318 CCT; the wording of subheading 7318 14 99 CCT, covering other self-tapping screws (not self-tapping), of steel (not stainless steel) Text to codes 7318, 7318 14, 7318 14 99, 7318 14 99 90