Screw
Screw
Screw
Screw and driver therefor
Screw and screw forming tool
Screw and screwdriver
Screw and wrench for snugly-fitted tightenings
Screw drive construction
Screw driving socket
Screw having an improved head structure
Screw head with slant rib
Screw with a convenient screw head
Screw with a convenient screw head
Screw with an improved head
Screw with an improved head structure and punch for forming...
Screw with compound recesses
Screw with improved head design
Screw with tamper-proof head
Screws
Security fastener and drive tool for driving both security faste