Very convenient and practical. It is Multifunction, it can also be the practical wrench, to turning the screw. 4 different keys, can open the toolbox doors, electric doors, especially suitable for the doors and windows of public places.
eBay
304 Stainless Steel Radiators Vent Key Metal Plumbing Bleed Wrench Portable Heating Cross Keys Wrench Repair Tools M4YD
Aliexpress UK
MATERIAL: Key are made of solid brass & zinc alloys, which make it sturdy and durable that do not bend or break, hence a lifelong asset.
eBay
Multifunction 4 Ways Universal Triangle Wrench Key Plumber Keys Triangle For Gas Electric Meter Cabinets Bleed Radiators
Aliexpress UK
Radiator Bleed Keys in various designs. All colours of utility key. fit uk radiators AND. have the uk water stop cock fitting.
eBay
Multifunction 4 Ways Universal Triangle Wrench Key Plumber Keys Triangle for Gas Electric Meter Cabinets Bleed Radiators
Aliexpress UK
Suitable for 99% of radiators to bleed radiators. Choice of 1, 2 or 5 Brass Keys.
eBay
Multifunction 4 Ways Universal Triangle Wrench Key Plumber Keys Triangle Wrench For Gas Electric Meter Cabinets Bleed Radiators
Aliexpress UK
2 X GOOD QUALITY SOLID BRASS RADIATOR KEYS.
eBay
Multifunction Key Wrench 4 Ways Universal Plumber Keys Triangle For Gas Electric Meter Cabinets Bleed Radiators
Aliexpress UK
Wow, what a brilliant key! At 4.75mm, a snug fit on all my bleed screws. Large physical size of 'wings' give plenty of torque on stiff bleed screws without rounding off the square. I wish that I had had one of these in my toolkit years ago.
eBay
7MM Brass Venting Air Valve Radiator Plumbing Bleed Solid Water Tap Faucet Accessories Switch Use Square Spool Bleeding Key
Aliexpress UK
Small Square, Large Square, Triangle & Offset Flat Key.
eBay
2Pcs Bleed Key Square Socket Faucet Water Tap Brass Radiator Special Lock Hole Plumbing
Aliexpress UK
Made of premium grade brass to ensure the key does not round the head of your radiator bleed valve/nipple. Manufactured with a Square opening these keys will fit almost every radiator on the market!
eBay
4 In 1 Universal Faucet Wrench Square Key Plumber Bathroom Wrench 6.5/7/8/9mm for Gas Electric Meter Cabinets Bleed Radiators
Aliexpress UK