These are hook anchor bolt.There have a sleeve that expands as you tighten the bolt for a secure hold in block and brick. They're often used to mount shelving and anchor bollards and guard rails.
Size | φ D | M | L1 | L |
M6 | 8 | 6 | 35 | 87 |
M8 | 10 | 6 | 37 | 99 |
M10 | 12 | 8 | 38 | 110 |
M12 | 14 | 8 | 48 | 130 |