Instant Buy M4 x 0.7 x 40mm Security Machine Screw – Flat Torx Head – 18-8 Stainless Steel – FT – UNC – 100 Pk

Security fasteners provide an added level of security by their drive design that prevents removal with ordinary screw drivers. Maximum torque transfer & positive tool engagement means easier drive installation with less pressure & slippage. Requires matching driver bit.
Flat Head screws install flush with metal surfaces or countersinks with softer materials for a clean appearance.