Why would any manufacturer still produce screws with a slot head

Why would any manufacturer still produce screws with a slot head slot screw 34In #4 Sst Wood Screw Slot,Pk100,Pack Of 6 : : Industrial & Scientific slot highlander For Vintage & Antique Machine Enthusiasts - Coin slot screws

slot highlander Description The screw is produced in hardened carbon steel with bright zinc plated surface treatment It is equipped with hex head and Philips crosshead Ph2

slot city бонуси Choose from our selection of T-slot screws, including T-slotted framing fasteners, T-slot bolts, and more In stock and ready to ship  T-BoltsStuds are produced to Din 787Din 6379 and Strength class 8,810,9 and Extra strength T-Bolts to Class Rhombus T-Slot Bolts to Strength Class