Kennedy-Pro 9mm Single Hex Socket 1/2 Square Drive
Teng M121509-C S2 Hexagon Socket Bit 1/2in Drive 9mm TENM121509C | DIY at B&Q
9mm x 1/2in Drive Hexagon Bit Socket · Ejay Online
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 :
BERGEN Hex Socket H9mm 1/2" Drive 55mm 9mm Hex Key Single Socket Allen Key | eBay
Expert Hexagon Socket 6 Point Long Reach 1/4in Drive 9mm | Power Tools Direct