4.5 x 75mm Timco C2 Deck-Fix Decking Screws, Torx Countersunk, Green - Tub of 250 (75C2D250) 2x Do I need to pre-drill

Do I need to pre-drill for concrete screws

9/16 UNF Threaded Bar

Overall domed nut height (H): 52mm

Designed for roofing applications - Ideal for slate

4.5 x 75mm Timco C2 Deck-Fix Decking Screws, Torx Countersunk, Green - Tub of 250 (75C2D250) 2x Do I need to pre-drillCorrosion Resistant Decking Screws Tub of 250 Deck Fix decking screws from Timco, purpose built for timber decking and outdoor construction. Designed with features to get the job done including a twin cut point that ensures rapid installation while reducing timber splitting and a strengthened head to prevent shearing if used with impact tools. Designed with a countersunk head with reinforcing ribs that improves countersinking and ensures a storing