Teng 10mm 1/2" Drive Hex Bit Metric Socket M121510-c
Hex Socket 10mm H10 M10 1/2" Drive Allen Key Single Socket Hex Key 55mm Length | eBay
Halfords Advanced Hexagon Bit Socket 10mm 1/2" Drive | Halfords UK
sourcingmap 1/2" Drive x H10 (10mm) Hex Bit Socket, S2 Steel Bits CR-V Sockets 4" Length Use with Ratchet Wrench, Slide Bar, Extension Rod : Amazon.co.uk: DIY & Tools