Machine Screw, Fully Threaded, Measurement System: Imperial, 1/4-20 Thread, 1/2 in Overall Length, A2 18-8 Stainless Steel, Flat Head, Zinc Blue, Phillips Drive, 39 to 44 HRC Hardness, UNC Thread

ITEM FEATURES:

• 145000 psi tensile strength
• Provides good control in driving
• A counter sunk head with a flat top surface and a cone shaped bearing surface
• Always use a driver bit in good condition