GEARWRENCH 1/4" Drive Pass-Thru 72 Tooth XL Locking Flex Head Ratchet 6-1/2" 891400GEARWRENCH 1 4" Drive Pass Thru 72 Tooth XL Locking Flex Head Ratchet 6 1 2" 891400 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% stronger than standard ratchets by eliminating the drive tang. The ratchets are up to 50% thinner than standard ratchets