Quickly change between 5/16 in and 3/8 in hex sizes with Malco 's unique, exclusive, dual-sided magnetic hex drivers. The reversible hex socket fits over a 5/16 in magnet-tipped, ball locking hex shaft and can be quickly reversed to change sizes. Eliminate troublesome buildup of metal shavings in the hex tip with the "easy clean magnet". Just swipe with a glove or shop towel to clear any metal shavings. Tested torque of the reversible hex chuck driver design is equal to one piece drivers. The 5/16 in side is made with a slimmer profile to easily reach tight areas. With single-piece strength and an indestructible magnet, this hex driver is the perfect companion for any trade professional.