M4 x 20mm Torx Pin Countersunk Security Screws - A2 Stainless Steel Torx Pin Countersunk Security Screws, also known as Resistorx, Pin Torx or Stardrive pin, feature a flat countersunk head and an internal 6-lobe pin socket drive. The torx pin drive allows for force to be more evenly distributed whilst tightening. This means a higher level of torx can be applied to the fixture and also reduces the chances of cam-out, which may cause damage to the screw drive. The internal pin drive adds a level of security to these screws, as a standard torx bit cannot be inserted. These security screws must instead be paired with a security drill bit, resulting in a tamper-proof fastening. Click Here to view the installation video.  These 6-Lobe Torx Pin Countersunk Security Screws are made from A2 Stainless Steel which provides corrosion and oxidation resistance. For larger quantities or items not listed, please email and one of our team will provide you with a quotation. M4 x 20mm Torx Pin Countersunk Security Screws - A2 Stainless Steel