Defender Security E 2293-C Diecast Vintage Lock Bit Key with H-23 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 3/32 in. Thick bit with two outer cuts at 5/32 in. X 1/16 in. & two inner cuts at 1/16 in. X 5/32 in Zinc Plated finish Diecast construction Key Number H23