made of steel, use in wallboard, plaster, paneling remove screw as often as needed.

Part No.  Length    Drill Ø      Range     Screw Length 
HWA4XS      20mm      8mm      up-4mm      28mm
HWA4S 32 8 3~9 41
HWA4SL 46 8 3~20 54
HWA4L 46 8 16~21 54
HWA6S 52 11 3~6 60
HWA6L 65 11 14~32 74
HWA6XL 80 11 28~45 89
HWA8S 52 13 3~6 60
HWA8L 65 13 14~32 74
HWA8XL 80 13 28~45 89