Product Description Diameter:14mm Material:brass VISUAL RANGE:200 Usage for doors:50-75mm   Q1. Do you offer free samples? A1: Free samples are available . Q2. Do you offer OEM service and can you product as our drawings? A2: Yes, we can customize according to your drawing , or make drawing according to sample as your requirement. Q3. Do you accept our design on boxes? A3: Yes. We accept.