Defender Security E 2293-V Diecast Vintage Lock Bit Key with H-10 Key Number, Zinc Plated The vintage lock Sets that these keys are compatible with are those manufactured by Prime-Line Products, which are designed for interior use only 1/8 in. Thick bit with two outer cuts at 3/32 in. X 3/32 in Zinc Plated finish Diecast construction Key Number H10