* Hex-washer-headed for quick joining of steel sheets without pre-dril...

* Pan-headed for quick joining of steel sheets without pre-drilling *...

* Bulge head to fasten plasterboard onto metals (e.g. 0.8~2.5mm-thick ...

Hex-washer-flanged head (roofing screws)

Flat-headed, with wing & shank slots; fasten wood onto heavy-gauge met...

Double-threaded, hex-washer-headed; fasten steel sheets onto wood beam...

Hex-flange-headed, hi-lo-threaded

* Unique, corrosion-resistant finish * Ridges beneath screw head

* Bulge-headed, coarse-threaded drywall screws * Hardened, countersun...

* Twin-thread for two-times faster setting * Countersunk head for ext...