Netzerkoz 420 Pieces Smart Countersunk Head Screw Set – 8 Types of Drill Bits Smart Screw Set

On metal or similar surfaces, the hole where the screws will enter must be drilled with a drill before. "you can easily do these operations with drill bit screws, also known as ""smart screws""." Thanks to its drill-bit-like head, there is no need to drill the hole where the screw will go beforehand. 70pieces 3 9x13 60pcs 3 9x16 50pcs 3 9x19 30pcs 3 9x25 70pcs 4 2x13 60pcs 4 2x16 50pcs 4 2x19 30 pieces 4 2x25