The pass-thru socket and GearRatchet ratchet system by GEARWRENCH was designed to improve productivity and access on every job. The GearRatchet ratchets need as little as 5 degree to move fasteners vs 30 degree for standard wrenches and are 40 percent stronger than standard ratchets by eliminating the drive tang. The ratchets are up to 50 percent thinner than standard ratchets providing superior access to even the most hard to reach fasteners. The pass-thru sockets are a thin wall design. They replace the need for deep well sockets as they loosen and drive nuts on bolts of any length. The pass-thru sockets integrate into the GEARWRENCH GearRatchet handle, reducing overall height and increasing torque strength. The GEARWRENCH adapter allows for the use of standard sockets and drive tools. The 891427 is a 27 piece 1/4 in drive SAE/metric 6 point set featuring 5/32 in to 9/16 in and 3.5 mm to 13 mm sockets, 1 drive adapters to convert for use with standard socket sets, 2 extensions, and a XL locking flex GearRatchet ratchet. Set is in a blow molded case for storage and tool retention. Up to 50% thinner head profile than conventional ratchet systems 5 degree ratcheting arc Up to 40% stronger than traditional ratchets by eliminating the drive tang Pass-thru socket system eliminates the need for deep well sockets 11 locking head positions Dual material comfort grip handle