Britool 1/2″ drive 17mm double hex socket model number EBM17 . Vintage proper old school quality English made used tool. Please take the time to study the pictures carefully for condition and sizes as they form part of the description. Check out my shop listings I have lots more Britool tools – vintage/old stock/used and new. Also lots of other quality tools and quirky collectible items. Happy to combine postage wherever possible. #A4