Allen 3mm Hex Keys & Hex Wrenches for sale | eBay- 3mm allen wrench long shaft ,7PCS Mini Hexagon Hex Allen Key Set Wrench Screwdriver Micro Tool Kit 0.7mm-3mm. £4.07. (£4.07/Unit) £1.75 postage. or Best Offer. Allen 57122 3mm Short Arm Hex Key Wrench 5pcs. USA. £1.80. £12.98 postage.Allen Wrenches | McMaster-CarrThe assorted keys in these sets have an insulated handle and shaft that protect against shock from accidental contact with live electrical circuits. These tools are tested to 1, 000 volts to meet IEC 600 and ASTM F1505-01. They have a long shaft that reaches into tight spots to turn fasteners.