Features and Benefits * Jaws adjust to tightly secure taps from #6 to 1/2" taps * 3/8" square drive compatible with common ratchets * Small profile for use in tight workspaces * Knurled ring twist to adjust for quick fit * 2 piece set for greater versatility Both adjustable tap sockets are 3/8" drive, one fits #6 through 1/4" taps and the second adjustable socket fits 1/4" through 1/2" taps. This Irwin inovation allows the easy use and changing of various sizes of taps.