... design, with different keys back in seven of the rebound in the marble hole, several make marbles combination increase a ... few times, match on special marbles, make the lock core structure technology to be more perfect, more combination ... 68mm, 70mm, 80mm, 90mm, 100mm 3. Key slot: COMPUTER key 4. Lock core: Brass 5. Key material: Brass, iron, plastic handle 6. Surface coating: Nickelizing ...