TRUMBULL Lighted Keys make it easier for the operator to see the 2"nut on a main valve or t-head of a curb stop. Both models feature handles and shafts fabricated from Sch40 steel pipe and extra strength tool castings. Valve key socket fits 2" square operating nuts. Combination curb key casting fits t-head of curb stops up to 2" standard pentagon nut and various curb box rods. Light is designed to be water-resistant and shock-proof. LED bulb is rated for 100,000 hours. AAAA batteries can easily be replaced in the field.