M12 x 200mm Socket Cap Head Screw, A2 Stainless Steel DIN 912 Trojan Do I need to pre-drill

Do I need to pre-drill for concrete screws

F: 90mm approx

Overall Length: 260mm

Diameter: 10mm

What does “double countersunk” mean and why is it useful

M12 x 200mm Socket Cap Head Screw, A2 Stainless Steel DIN 912 Trojan Do I need to pre-drillM12 socket cap head screw Socket cap head screw with a high corrosion resistance, designed with a deep internal socket (hex) recess allowing you to apply the required torque for a secure hold. Manufactured in A2 stainless steel for a high level of corrosion resistance making them a versatile choice for internal and external applications. Designed with a distinctive compact cylindrical head which makes them useful when space is tight and installed with