The Ultra thin Hole-Thru Sockets & extension are designed to reach into deep recesses & eliminates the need for deep sockets. As the hole-thru socket fits into the ratchet head overall height is reduced by 50%. Individual Sizes (Available Separately): Item No. Size Drive Description Length M5510 10mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5511 11mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5512 12mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5513 13mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5514 14mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5515 15mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5516 16mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5517 17mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5518 18mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5519 19mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5521 21mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5522 22mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5524 24mm M19 Hex Multi-Lock Hole-Thru Socket 32mm M5503 75mm x M19 Drive Hole-Thru Extension 75mm M5504 3/8" Sq. Dr. x M19 Drive Quick Release Adaptor 25mm M5505 1/2" Sq. Dr. x M19 Drive Quick Release Adaptor 30mm M5506 M19 Drive Hole-Thru Reversible Ratchet 215mm