How to Remove a Stubborn Nut/Bolt : 15 Steps (with Pictures) - Instructables
Stove Bolts with Square Nuts - Screws - Bolts, Screws, & Nails - Fasteners & Products
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Triple Square Socket Set TIT16144 - The Home Depot
CTA 13/16in Emergency Lug Nut Remover Socket
Socket wrench - Wikipedia
What tool can I use to unscrew a screw with a square shape hole? I want something like an Allen wrench because it's blocked by the sink so there's very little space. -