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° to move fasteners vs. 30° for standard wrenches and are 40% stronger than standard ratchets by eliminating the drive tang. The ratchets are up to 50% 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 8921 is a 21 piece 3/8 in. Drive SAE/metric 6 point set featuring 7 SAE and 10 metric sockets, 2 drive adapters 1/4 in. And 3/8 in. To convert for use with standard 1/4 in. And 3/8 in. Drive socket sets, a 3 in. Hole-through extension, and a GearRatchet™ ratchet. Set is in a blow molded case for storage and tool retention.