Clutch Head Screws are low cost “One Way” security screws
Clutch Bit -Depth Setting Tool - LaBearTools
Clutch head screws - YouTube
Screwdriver Bit Set, 50pcs Magnetic Extra Long Security Bit Set, Multi Screw Bits Kit with Star, TP Star, Clutch, Square, Flat, Cross, Hex Bits, Professional Drill Accessories : Amazon.co.uk: DIY & Tools
CTA Clutch-Head Bit Socket Set 4 Piece
Barnwell Set of 3 Security Tamperproof Clutch Head Screwdriver Bits 4mm, 5mm, 6mm Bowtie : Amazon.co.uk: DIY & Tools