Pan washer head security screw with pin pole in the centre of head for anti-theft , only special screwdrive can be used to screw out screws , a comprehensive use in car , buliding and machines etc . Self tapping coarse threads will be extruded into material tightly . About product 1. Material : Harden Steel 2. Finish : Chrome zinc 3. SIze : M3X10 4. Socket drive : T20 5. Case hardness : HV500 |