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These upgraded PCB screws have a smaller head diameter to eliminate grounding issues on the PCB circuit board tracks. Older versions of these screws being sold in the market have a larger diameter head that can make contact with the PCB board circuit tracks that cause shorting and grounding in the old EHC's and the new RIP kits that can cause erratic hand control function issues. These screws will fit our new upgraded PCB boards, older factory PCB boards, and even aftermarket PCB boards.