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BRAZEN 4mm Hex Bit Socket/Allen Driver Three Pack (1/4" Drive, Short) - - Amazon.com
Amazon.com: Extra Long Allen Wrench Hex Bit Socket Set (10 Pack) - Long 6" Hex Bit in 3/8" Metric Drive Sizes: 3mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, and 10mm :
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System 4 Torx Head Insert Bit for 4mm Micro Hex Drive, T6 x 28mm Long: Amazon.com: Tools & Home Improvement
uxcell 3 Pcs H4 (4mm) Ball End Screwdriver Bits, S2 Steel Magnetic 5.1 Inch Long Drill Bit with 1/4 Inch Hex Shank - - Amazon.com
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VEGA 4mm Hex Power Bits. Professional Grade ¼ Inch Hex Shank 4mm, 2 Inch Power Bits. 150H040A-4 (Pack of 4) - - Amazon.com
Amazon.com: Titan Tools - 1/4 Dr. 4Mm Hex Bit Socket (15604) : Tools & Home Improvement