B&P Lamp Solid Brass Knurled Key, 1" Long - B&P Lamp Solid Brass Knurled Key, 1" Long, Solid Brass Knurled Key, 1 inch long, Tap 4-36F (fits most lamp socket stems). Features Include: Solid Brass Knurled Key, 1" Long, Solid Brass Knurled Key 1 inch long Tap 4-36F (fits most, 1 inch long Tap 4-36F (fits most lamp socket stems)