And newer residential electrical recepticals, switches and breakers have the "ECX" screws that 'somewhat' take a Phillips or slot but not very well. Milwaukee makes an ECX1 and an ECX2 bit and a ECX screw driver that fits snug and lets you tighten without slippage or messing up the screw head.I didn't know there were so many types of screw drives. I never liked those slotted or flat heads.
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