304 Stainless Steel: Made from high grade 304 stainless steel, this radiator air vent key offers a metal construction suited for repeated radiator bleeding tasks the material choice supports everyday use in home radiator maintenance without adding unnecessary bulk to your tool kit. Compact Access: Measuring 2.75 x 0.59 x 0.35 in, this small radiator vent key is sized for hard to reach heatsinks, tight corners, and narrow gaps around heating equipment its compact shape makes it easier to position on the valve when space is limited. Easy Operation: to use this radiator valve key, place the sturdy vent on the valve and turn it gently for controlled bleeding the simple design supports quick handling during routine maintenance and helps make radiator bleeding more straightforward for homeowners and repair kits. Weight: 0.044 pounds.